Bump tslint from 5.16.0 to 5.20.0 (#4487)

Bumps [tslint](https://github.com/palantir/tslint) from 5.16.0 to 5.20.0.
- [Release notes](https://github.com/palantir/tslint/releases)
- [Changelog](https://github.com/palantir/tslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/palantir/tslint/compare/5.16.0...5.20.0)
Signed-off-by: Ndependabot-preview[bot] <support@dependabot.com>

package-lock.json

@@ -20540,18 +20540,18 @@
       "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ=="
     },
     "tslint": {
-      "version": "5.16.0",
-      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.16.0.tgz",
-      "integrity": "sha512-UxG2yNxJ5pgGwmMzPMYh/CCnCnh0HfPgtlVRDs1ykZklufFBL1ZoTlWFRz2NQjcoEiDoRp+JyT0lhBbbH/obyA==",
+      "version": "5.20.0",
+      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.20.0.tgz",
+      "integrity": "sha512-2vqIvkMHbnx8acMogAERQ/IuINOq6DFqgF8/VDvhEkBqQh/x6SP0Y+OHnKth9/ZcHQSroOZwUQSN18v8KKF0/g==",
       "dev": true,
       "requires": {
         "@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",
@@ -20560,12 +20560,6 @@
         "tsutils": "^2.29.0"
       },
       "dependencies": {
-        "diff": {
-          "version": "3.5.0",
-          "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
-          "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
-          "dev": true
-        },
         "semver": {
           "version": "5.7.1",
           "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",

package.json

@@ -184,7 +184,7 @@
     "tar": "5.0.2",
     "through2": "3.0.1",
     "ts-node": "8.4.0",
-    "tslint": "5.16.0",
+    "tslint": "5.20.0",
     "typescript": "3.4.5",
     "wait-on": "3.2.0",
     "webpack-dev-server": "3.9.0"