Merge pull request #2450 from mgechev/greenkeeper/gulp-uglify-pin-3.0.1

fix: pin gulp-uglify to 3.0.1

Author: mgechev

package.json

@@ -109,7 +109,7 @@
     "gulp-template": "^5.0.0",
     "gulp-tslint": "^8.1.3",
     "gulp-typescript": "^4.0.2",
-    "gulp-uglify": "^3.0.1",
+    "gulp-uglify": "3.0.1",
     "gulp-watch": "^5.0.1",
     "is-ci": "^2.0.0",
     "isstream": "^0.1.2",