diff --git a/example/package-lock.json b/example/package-lock.json
index 686428c..aa217e1 100644
--- a/example/package-lock.json
+++ b/example/package-lock.json
@@ -27,9 +27,9 @@
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-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
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+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
+      "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
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@@ -44,9 +44,9 @@
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-      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.1.1.tgz",
-      "integrity": "sha512-wdlPY2tm/9XBr7QkKlq0WQVgiuGTX6YWPyRyBviSoScBuLfTVQhvwg6wJ369GJ/1nPfTLMfnrFIfjqVg6d+jQQ==",
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
+      "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA==",
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     },
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@@ -64,6 +64,12 @@
       "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8=",
       "dev": true
     },
+    "array-filter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-1.0.0.tgz",
+      "integrity": "sha1-uveeYubvTCpMC4MSMtr/7CUfnYM=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.1.11.tgz",
@@ -71,14 +77,23 @@
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-      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
-      "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
       "dev": true,
       "requires": {
         "bn.js": "^4.0.0",
         "inherits": "^2.0.1",
-        "minimalistic-assert": "^1.0.0"
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
+      },
+      "dependencies": {
+        "bn.js": {
+          "version": "4.11.9",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.9.tgz",
+          "integrity": "sha512-E6QoYqCKZfgatHTdHzs1RRKP7ip4vvm+EyRUeE2RF0NblwVvb0p6jSVeNTOFxPn26QXN2o6SMfNxKp6kU8zQaw==",
+          "dev": true
+        }
       }
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     "assert": {
@@ -103,6 +118,15 @@
       "integrity": "sha1-trvgsGdLnXGXCMo43owjfLUmw9E=",
       "dev": true
     },
+    "available-typed-arrays": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.2.tgz",
+      "integrity": "sha512-XWX3OX8Onv97LMk/ftVyBibpGwY5a8SmuxZPzeOxqmuEqUCOM9ZE+uIaD1VNJ5QnvU2UQusvmKbuM1FR8QWGfQ==",
+      "dev": true,
+      "requires": {
+        "array-filter": "^1.0.0"
+      }
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       "resolved": "https://registry.npmjs.org/aws-sign/-/aws-sign-0.3.0.tgz",
@@ -122,9 +146,9 @@
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-      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
-      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA==",
+      "version": "5.1.3",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.1.3.tgz",
+      "integrity": "sha512-GkTiFpjFtUzU9CbMeJ5iazkCzGL3jrhzerzZIuqLABjbwRaFt33I9tUdSNryIptM+RxDet6OKm2WnLXzW51KsQ==",
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@@ -175,32 +199,24 @@
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-      "resolved": "https://registry.npmjs.org/browser-resolve/-/browser-resolve-1.11.3.tgz",
-      "integrity": "sha512-exDi1BYWB/6raKHmDTCicQfTkqwN5fioMFV4j8BsfMU4R2DK/QfZfK7kOVkmWCNANf0snkBzqGqAJBao9gZMdQ==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/browser-resolve/-/browser-resolve-2.0.0.tgz",
+      "integrity": "sha512-7sWsQlYL2rGLy2IWm8WL8DCTJvYLc/qlOnsakDac87SOoCd16WLsaAMdCiAqsTNHIe+SXfaqyxyo6THoWqs8WQ==",
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-          "integrity": "sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=",
-          "dev": true
-        }
+        "resolve": "^1.17.0"
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     "browserify": {
-      "version": "16.5.1",
-      "resolved": "https://registry.npmjs.org/browserify/-/browserify-16.5.1.tgz",
-      "integrity": "sha512-EQX0h59Pp+0GtSRb5rL6OTfrttlzv+uyaUVlK6GX3w11SQ0jKPKyjC/54RhPR2ib2KmfcELM06e8FxcI5XNU2A==",
+      "version": "17.0.0",
+      "resolved": "https://registry.npmjs.org/browserify/-/browserify-17.0.0.tgz",
+      "integrity": "sha512-SaHqzhku9v/j6XsQMRxPyBrSP3gnwmE27gLJYZgMT2GeK3J0+0toN+MnuNYDfHwVGQfLiMZ7KSNSIXHemy905w==",
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         "JSONStream": "^1.0.3",
         "assert": "^1.4.0",
         "browser-pack": "^6.0.1",
-        "browser-resolve": "^1.11.0",
+        "browser-resolve": "^2.0.0",
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         "buffer": "~5.2.1",
         "cached-path-relative": "^1.0.0",
@@ -209,31 +225,31 @@
         "constants-browserify": "~1.0.0",
         "crypto-browserify": "^3.0.0",
         "defined": "^1.0.0",
-        "deps-sort": "^2.0.0",
+        "deps-sort": "^2.0.1",
         "domain-browser": "^1.2.0",
         "duplexer2": "~0.1.2",
-        "events": "^2.0.0",
+        "events": "^3.0.0",
         "glob": "^7.1.0",
         "has": "^1.0.0",
         "htmlescape": "^1.1.0",
         "https-browserify": "^1.0.0",
         "inherits": "~2.0.1",
-        "insert-module-globals": "^7.0.0",
+        "insert-module-globals": "^7.2.1",
         "labeled-stream-splicer": "^2.0.0",
         "mkdirp-classic": "^0.5.2",
-        "module-deps": "^6.0.0",
+        "module-deps": "^6.2.3",
         "os-browserify": "~0.3.0",
         "parents": "^1.0.1",
-        "path-browserify": "~0.0.0",
+        "path-browserify": "^1.0.0",
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         "querystring-es3": "~0.2.0",
         "read-only-stream": "^2.0.0",
         "readable-stream": "^2.0.2",
         "resolve": "^1.1.4",
-        "shasum": "^1.0.0",
+        "shasum-object": "^1.0.0",
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-        "stream-browserify": "^2.0.0",
+        "stream-browserify": "^3.0.0",
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@@ -242,9 +258,33 @@
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         "tty-browserify": "0.0.1",
         "url": "~0.11.0",
-        "util": "~0.10.1",
+        "util": "~0.12.0",
         "vm-browserify": "^1.0.0",
         "xtend": "^4.0.0"
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+      "dependencies": {
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+          "version": "0.12.3",
+          "resolved": "https://registry.npmjs.org/util/-/util-0.12.3.tgz",
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+          "dev": true,
+          "requires": {
+            "inherits": "^2.0.3",
+            "is-arguments": "^1.0.4",
+            "is-generator-function": "^1.0.7",
+            "is-typed-array": "^1.1.3",
+            "safe-buffer": "^5.1.2",
+            "which-typed-array": "^1.1.2"
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+              "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
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+              "dev": true
+            }
+          }
+        }
       }
     },
     "browserify-aes": {
@@ -292,21 +332,56 @@
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         "bn.js": "^4.1.0",
         "randombytes": "^2.0.1"
+      },
+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.9.tgz",
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+        }
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     "browserify-sign": {
-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.0.4.tgz",
-      "integrity": "sha1-qk62jl17ZYuqa/alfmMMvXqT0pg=",
-      "dev": true,
-      "requires": {
-        "bn.js": "^4.1.1",
-        "browserify-rsa": "^4.0.0",
-        "create-hash": "^1.1.0",
-        "create-hmac": "^1.1.2",
-        "elliptic": "^6.0.0",
-        "inherits": "^2.0.1",
-        "parse-asn1": "^5.0.0"
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/browserify-sign/-/browserify-sign-4.2.1.tgz",
+      "integrity": "sha512-/vrA5fguVAKKAVTNJjgSm1tRQDHUU6DbwO9IROu/0WAzC8PKhucDSh18J0RMvVeHAn5puMd+QHC2erPRNf8lmg==",
+      "dev": true,
+      "requires": {
+        "bn.js": "^5.1.1",
+        "browserify-rsa": "^4.0.1",
+        "create-hash": "^1.2.0",
+        "create-hmac": "^1.1.7",
+        "elliptic": "^6.5.3",
+        "inherits": "^2.0.4",
+        "parse-asn1": "^5.1.5",
+        "readable-stream": "^3.6.0",
+        "safe-buffer": "^5.2.0"
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+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
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+          "dev": true
+        },
+        "readable-stream": {
+          "version": "3.6.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
+          "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
+          "dev": true,
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
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+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
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+          "dev": true
+        }
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     },
     "browserify-zlib": {
@@ -492,13 +567,21 @@
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-      "resolved": "https://registry.npmjs.org/create-ecdh/-/create-ecdh-4.0.3.tgz",
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+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/create-ecdh/-/create-ecdh-4.0.4.tgz",
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       "requires": {
         "bn.js": "^4.1.0",
-        "elliptic": "^6.0.0"
+        "elliptic": "^6.5.3"
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+          "version": "4.11.9",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.9.tgz",
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+          "dev": true
+        }
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@@ -650,6 +733,14 @@
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         "miller-rabin": "^4.0.0",
         "randombytes": "^2.0.0"
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+          "version": "4.11.9",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.9.tgz",
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+          "dev": true
+        }
       }
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@@ -668,9 +759,9 @@
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-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.2.tgz",
-      "integrity": "sha512-f4x70okzZbIQl/NSRLkI/+tteV/9WqL98zx+SQ69KbXxmVrmjwsNUPn/gYJJ0sHvEak24cZgHIPegRePAtA/xw==",
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+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.3.tgz",
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@@ -680,6 +771,14 @@
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         "minimalistic-crypto-utils": "^1.0.0"
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+          "version": "4.11.9",
+          "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.9.tgz",
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+          "dev": true
+        }
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@@ -774,9 +873,9 @@
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+      "resolved": "https://registry.npmjs.org/events/-/events-3.2.0.tgz",
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@@ -801,6 +900,12 @@
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+      "resolved": "https://registry.npmjs.org/foreach/-/foreach-2.0.5.tgz",
+      "integrity": "sha1-C+4AUBiusmDQo6865ljdATbsG5k=",
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@@ -992,13 +1097,39 @@
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-      "integrity": "sha1-X8hoaEfs1zSZQDMZprCj8/auSRg=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/hash-base/-/hash-base-3.1.0.tgz",
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-        "inherits": "^2.0.1",
-        "safe-buffer": "^5.0.1"
+        "inherits": "^2.0.4",
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+          "dev": true
+        },
+        "readable-stream": {
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+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
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+          "dev": true,
+          "requires": {
+            "inherits": "^2.0.3",
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+            "util-deprecate": "^1.0.1"
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+          "dev": true
+        }
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     },
     "hash.js": {
@@ -1109,9 +1240,9 @@
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+        }
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+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/stream-browserify/-/stream-browserify-3.0.0.tgz",
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-        "readable-stream": "^2.0.2"
+        "inherits": "~2.0.4",
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+          "dev": true
+        },
+        "readable-stream": {
+          "version": "3.6.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
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+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/stream-http/-/stream-http-3.1.1.tgz",
+      "integrity": "sha512-S7OqaYu0EkFpgeGFb/NPOoPLxFko7TPqtEeFg5DXPB4v/KETHG0Ln6fRFrNezoelpaDKmycEmmZ81cC9DAwgYg==",
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-        "inherits": "^2.0.1",
-        "readable-stream": "^3.0.6",
-        "xtend": "^4.0.0"
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.6.0",
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+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
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+          "dev": true
+        },
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           "version": "3.6.0",
           "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
@@ -2008,14 +2184,6 @@
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@@ -2092,9 +2260,9 @@
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+          "version": "5.2.1",
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@@ -2302,6 +2470,20 @@
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+    "which-typed-array": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.2.tgz",
+      "integrity": "sha512-KT6okrd1tE6JdZAy3o2VhMoYPh3+J6EMZLyrxBQsZflI1QCZIxMrIYLkosd8Twf+YfknVIHmYQPgJt238p8dnQ==",
+      "dev": true,
+      "requires": {
+        "available-typed-arrays": "^1.0.2",
+        "es-abstract": "^1.17.5",
+        "foreach": "^2.0.5",
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diff --git a/example/package.json b/example/package.json
index e90a611..927f928 100644
--- a/example/package.json
+++ b/example/package.json
@@ -20,7 +20,7 @@
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