Update dependency uglifyjs-webpack-plugin to v1.2.6

package.json

@@ -40,7 +40,7 @@
     "tslint": "5.9.1",
     "tslint-react": "3.5.1",
     "typescript": "2.8.1",
-    "uglifyjs-webpack-plugin": "1.2.4",
+    "uglifyjs-webpack-plugin": "1.2.6",
     "webpack": "4.5.0",
     "webpack-cli": "2.0.14",
     "webpack-serve": "0.3.1"

yarn.lock

@@ -10118,9 +10118,9 @@ 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"
 
-[email protected].4, uglifyjs-webpack-plugin@^1.2.4:
-  version "1.2.4"
-  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.4.tgz#5eec941b2e9b8538be0a20fc6eda25b14c7c1043"
+[email protected].6:
+  version "1.2.6"
+  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.6.tgz#f4bb44f02431e82b301d8d4624330a6a35729381"
   dependencies:
     cacache "^10.0.4"
     find-cache-dir "^1.0.0"
@@ -10139,6 +10139,19 @@ uglifyjs-webpack-plugin@^0.4.6:
     uglify-js "^2.8.29"
     webpack-sources "^1.0.1"
 
+uglifyjs-webpack-plugin@^1.2.4:
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.4.tgz#5eec941b2e9b8538be0a20fc6eda25b14c7c1043"
+  dependencies:
+    cacache "^10.0.4"
+    find-cache-dir "^1.0.0"
+    schema-utils "^0.4.5"
+    serialize-javascript "^1.4.0"
+    source-map "^0.6.1"
+    uglify-es "^3.3.4"
+    webpack-sources "^1.1.0"
+    worker-farm "^1.5.2"
+
 uid-number@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/uid-number/-/uid-number-0.0.6.tgz#0ea10e8035e8eb5b8e4449f06da1c730663baa81"