chore(package): update gulp-uglify to version 3.0.2

Closes #22

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
     "gulp-mocha": "3.0.1",
     "gulp-rename": "1.2.2",
     "gulp-replace": "0.5.4",
-    "gulp-uglify": "2.0.1",
+    "gulp-uglify": "3.0.2",
     "mkdirp": "0.5.1",
     "coveralls": "2.11.16",
     "istanbul": "0.4.5"