Revert "update: update dependency tslint to v5.20.1"

This reverts commit 1f323934c7.

package.json

@@ -47,7 +47,7 @@
     "sinon-chai": "3.3.0",
     "source-map-support": "0.5.16",
     "standard-version": "7.0.0",
-    "tslint": "5.20.1",
+    "tslint": "5.20.0",
     "tslint-clean-code": "0.2.10",
     "tslint-consistent-codestyle": "1.16.0",
     "tslint-etc": "1.9.2",

yarn.lock

@@ -2732,26 +2732,7 @@ tslint-sonarts@1.9.0:
   dependencies:
     immutable "^3.8.2"
 
-tslint@5.20.1:
+tslint@5.20.0, tslint@^5.9.1:
-  version "5.20.1"
-  resolved "https://artifacts.apextoaster.com/repository/group-npm/tslint/-/tslint-5.20.1.tgz#e401e8aeda0152bc44dd07e614034f3f80c67b7d"
-  integrity sha512-EcMxhzCFt8k+/UP5r8waCf/lzmeSyVlqxqMEDQE7rWYiQky8KpIBz1JAoYXfROHrPZ1XXd43q8yQnULOLiBRQg==
-  dependencies:
-    "@babel/code-frame" "^7.0.0"
-    builtin-modules "^1.1.1"
-    chalk "^2.3.0"
-    commander "^2.12.1"
-    diff "^4.0.1"
-    glob "^7.1.1"
-    js-yaml "^3.13.1"
-    minimatch "^3.0.4"
-    mkdirp "^0.5.1"
-    resolve "^1.3.2"
-    semver "^5.3.0"
-    tslib "^1.8.0"
-    tsutils "^2.29.0"
-
-tslint@^5.9.1:
   version "5.20.0"
   resolved "https://artifacts.apextoaster.com/repository/group-npm/tslint/-/tslint-5.20.0.tgz#fac93bfa79568a5a24e7be9cdde5e02b02d00ec1"
   integrity sha512-2vqIvkMHbnx8acMogAERQ/IuINOq6DFqgF8/VDvhEkBqQh/x6SP0Y+OHnKth9/ZcHQSroOZwUQSN18v8KKF0/g==