fix(package): update gulp-uglify to version 2.1.2

https://greenkeeper.io/

package.json

@@ -99,7 +99,7 @@
     "gulp-replace": "0.5.4",
     "gulp-tslint": "7.1.0",
     "gulp-typescript": "3.1.6",
-    "gulp-uglify": "2.1.1",
+    "gulp-uglify": "2.1.2",
     "gulp-util": "3.0.8",
     "inquirer": "3.0.6",
     "is-root": "1.0.0",