fix(package): update uglifyjs-webpack-plugin to version 1.1.4

package.json

@@ -169,7 +169,7 @@
 		"tslint": "5.8.0",
 		"typescript": "2.6.2",
 		"uglify-es": "3.2.0",
-		"uglifyjs-webpack-plugin": "1.1.3",
+		"uglifyjs-webpack-plugin": "1.1.4",
 		"uuid": "3.1.0",
 		"vhost": "3.0.2",
 		"web-push": "3.2.5",