Bump tslint from 5.15.0 to 5.20.0 in /assets

Bumps [tslint](https://github.com/palantir/tslint) from 5.15.0 to 5.20.0.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](palantir/tslint@5.15.0...5.20.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

assets/package.json

@@ -25,7 +25,7 @@
     "prettier": "^1.18.2",
     "sass-loader": "^8.0.0",
     "ts-loader": "^6.2.1",
-    "tslint": "^5.15.0",
+    "tslint": "^5.20.0",
     "tslint-config-prettier": "^1.18.0",
     "tslint-loader": "^3.5.4",
     "tslint-plugin-prettier": "^2.0.1",

assets/yarn.lock

@@ -1029,15 +1029,6 @@ aws4@^1.8.0:
   resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.8.0.tgz#f0e003d9ca9e7f59c7a508945d7b2ef9a04a542f"
   integrity sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==
 
-babel-code-frame@^6.22.0:
-  version "6.26.0"
-  resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.26.0.tgz#63fd43f7dc1e3bb7ce35947db8fe369a3f58c74b"
-  integrity sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=
-  dependencies:
-    chalk "^1.1.3"
-    esutils "^2.0.2"
-    js-tokens "^3.0.2"
-
 babel-loader@^8.0.5:
   version "8.0.5"
   resolved "https://registry.yarnpkg.com/babel-loader/-/babel-loader-8.0.5.tgz#225322d7509c2157655840bba52e46b6c2f2fe33"
@@ -1387,7 +1378,7 @@ chalk@2.4.2, chalk@^2.0.0, chalk@^2.3.0, chalk@^2.4.1, chalk@^2.4.2:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
-chalk@^1.1.1, chalk@^1.1.3:
+chalk@^1.1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
   integrity sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=
@@ -1543,12 +1534,7 @@ combined-stream@^1.0.6, combined-stream@~1.0.6:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@^2.12.1:
-  version "2.20.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
-  integrity sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==
-
-commander@^2.20.0, commander@~2.20.3:
+commander@^2.12.1, commander@^2.20.0, commander@~2.20.3:
   version "2.20.3"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
   integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
@@ -2011,10 +1997,10 @@ detect-libc@^1.0.2:
   resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
   integrity sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=
 
-diff@^3.2.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/diff/-/diff-3.5.0.tgz#800c0dd1e0a8bfbc95835c202ad220fe317e5a12"
-  integrity sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==
+diff@^4.0.1:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/diff/-/diff-4.0.1.tgz#0c667cb467ebbb5cea7f14f135cc2dba7780a8ff"
+  integrity sha512-s2+XdvhPCOF01LRQBC8hf4vhbVmI2CGS5aZnxLJlT5FtdhPCDFq80q++zK2KlrVorVDdL5BOGZ/VfLrVtYNF+Q==
 
 diffie-hellman@^5.0.0:
   version "5.0.3"
@@ -3188,12 +3174,7 @@ js-levenshtein@^1.1.3:
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
   integrity sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==
 
-js-tokens@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
-  integrity sha1-mGbfOVECEw449/mWvOtlRDIJwls=
-
-js-yaml@^3.13.0:
+js-yaml@^3.13.0, js-yaml@^3.13.1:
   version "3.13.1"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.13.1.tgz#aff151b30bfdfa8e49e05da22e7415e9dfa37847"
   integrity sha512-YfbcO7jXDdyj0DGxYVSlSeQNHbD7XPWvrVWeVUujrQEoZzWJIRrCPoyk6kL6IAjAG2IolMK4T0hNUe0HOUs5Jw==
@@ -5577,18 +5558,18 @@ tslint-plugin-prettier@^2.0.1:
     lines-and-columns "^1.1.6"
     tslib "^1.7.1"
 
-tslint@^5.15.0:
-  version "5.15.0"
-  resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.15.0.tgz#6ffb180986d63afa1e531feb2a134dbf961e27d3"
-  integrity sha512-6bIEujKR21/3nyeoX2uBnE8s+tMXCQXhqMmaIPJpHmXJoBJPTLcI7/VHRtUwMhnLVdwLqqY3zmd8Dxqa5CVdJA==
+tslint@^5.20.0:
+  version "5.20.0"
+  resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.20.0.tgz#fac93bfa79568a5a24e7be9cdde5e02b02d00ec1"
+  integrity sha512-2vqIvkMHbnx8acMogAERQ/IuINOq6DFqgF8/VDvhEkBqQh/x6SP0Y+OHnKth9/ZcHQSroOZwUQSN18v8KKF0/g==
   dependencies:
-    babel-code-frame "^6.22.0"
+    "@babel/code-frame" "^7.0.0"
     builtin-modules "^1.1.1"
     chalk "^2.3.0"
     commander "^2.12.1"
-    diff "^3.2.0"
+    diff "^4.0.1"
     glob "^7.1.1"
-    js-yaml "^3.13.0"
+    js-yaml "^3.13.1"
     minimatch "^3.0.4"
     mkdirp "^0.5.1"
     resolve "^1.3.2"