Update dependency uglifyjs-webpack-plugin to v2

Author: renovate-bot

package.json

@@ -82,7 +82,7 @@
     "tslint-config-prettier": "1.15.0",
     "typescript": "3.1.1",
     "uglify-es": "3.3.9",
-    "uglifyjs-webpack-plugin": "1.3.0",
+    "uglifyjs-webpack-plugin": "2.0.1",
     "webpack": "4.19.1",
     "webpack-cli": "3.1.0",
     "webpack-hot-client": "4.1.1",

yarn.lock

@@ -3092,7 +3092,7 @@ cacache@^10.0.4:
     unique-filename "^1.1.0"
     y18n "^4.0.0"
 
-cacache@^11.0.2:
+cacache@^11.0.2, cacache@^11.2.0:
   version "11.2.0"
   resolved "https://registry.yarnpkg.com/cacache/-/cacache-11.2.0.tgz#617bdc0b02844af56310e411c0878941d5739965"
   dependencies:
@@ -12595,11 +12595,31 @@ uglify-js@^2.6:
   optionalDependencies:
     uglify-to-browserify "~1.0.0"
 
+uglify-js@^3.0.0:
+  version "3.4.9"
+  resolved "https://registry.yarnpkg.com/uglify-js/-/uglify-js-3.4.9.tgz#af02f180c1207d76432e473ed24a28f4a782bae3"
+  dependencies:
+    commander "~2.17.1"
+    source-map "~0.6.1"
+
 uglify-to-browserify@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz#6e0924d6bda6b5afe349e39a6d632850a0f882b7"
 
-uglifyjs-webpack-plugin@1.3.0, uglifyjs-webpack-plugin@^1.2.4:
+uglifyjs-webpack-plugin@2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-2.0.1.tgz#f346af53ed496ce72fef462517d417f62bec3010"
+  dependencies:
+    cacache "^11.2.0"
+    find-cache-dir "^2.0.0"
+    schema-utils "^1.0.0"
+    serialize-javascript "^1.4.0"
+    source-map "^0.6.1"
+    uglify-js "^3.0.0"
+    webpack-sources "^1.1.0"
+    worker-farm "^1.5.2"
+
+uglifyjs-webpack-plugin@^1.2.4:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.3.0.tgz#75f548160858163a08643e086d5fefe18a5d67de"
   dependencies: