chore(deps): update dependency uglify-js to v3.4.6

Author: renovate-bot

package-lock.json

@@ -68,7 +68,7 @@
     "pretty-bytes-cli": "2.0.0",
     "semver": "5.5.0",
     "sinon": "4.5.0",
-    "uglify-js": "3.4.5",
+    "uglify-js": "3.4.6",
     "webpack": "3.12.0",
     "webpack-dev-server": "2.11.2"
   },