diff --git a/package-lock.json b/package-lock.json
index 46fd9dd..b272c3d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -883,6 +883,45 @@
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@@ -1217,6 +1256,42 @@
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+      "resolved": "https://registry.npmjs.org/@vuepress/plugin-pwa/-/plugin-pwa-1.8.2.tgz",
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+        "workbox-build": "^4.3.1"
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+            "toml": "^3.0.0",
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+        }
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@@ -1916,6 +2000,46 @@
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+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-object-rest-spread/-/babel-plugin-syntax-object-rest-spread-6.13.0.tgz",
+      "integrity": "sha1-/WU28rzhODb/o6VFjEkDpZe7O/U=",
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+      "resolved": "https://registry.npmjs.org/babel-plugin-transform-object-rest-spread/-/babel-plugin-transform-object-rest-spread-6.26.0.tgz",
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+      "dev": true,
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+      "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+      "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+      "dev": true,
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+      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
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@@ -4310,12 +4441,14 @@
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@@ -4490,12 +4629,14 @@
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@@ -4514,6 +4655,7 @@
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@@ -4594,7 +4736,8 @@
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@@ -4691,7 +4835,8 @@
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@@ -4727,6 +4872,7 @@
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@@ -4746,6 +4892,7 @@
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@@ -4789,12 +4936,14 @@
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@@ -5639,6 +5794,12 @@
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+      "resolved": "https://registry.npmjs.org/pretty-bytes/-/pretty-bytes-5.6.0.tgz",
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@@ -8252,6 +8419,12 @@
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+      "resolved": "https://registry.npmjs.org/register-service-worker/-/register-service-worker-1.7.2.tgz",
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@@ -9246,6 +9419,17 @@
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+      "resolved": "https://registry.npmjs.org/stringify-object/-/stringify-object-3.3.0.tgz",
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@@ -9261,6 +9445,16 @@
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+      "resolved": "https://registry.npmjs.org/strip-comments/-/strip-comments-1.0.2.tgz",
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+      "requires": {
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+        "babel-plugin-transform-object-rest-spread": "^6.26.0"
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+      "requires": {
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+    "workbox-broadcast-update": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/workbox-broadcast-update/-/workbox-broadcast-update-4.3.1.tgz",
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+      "requires": {
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+        "common-tags": "^1.8.0",
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+        "workbox-cacheable-response": "^4.3.1",
+        "workbox-core": "^4.3.1",
+        "workbox-expiration": "^4.3.1",
+        "workbox-google-analytics": "^4.3.1",
+        "workbox-navigation-preload": "^4.3.1",
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+        "workbox-streams": "^4.3.1",
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+        "workbox-window": "^4.3.1"
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+          "requires": {
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+            "jsonfile": "^4.0.0",
+            "universalify": "^0.1.0"
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