Update uglify-js (#557)

* Update uglify-js

Closes #553 (supported in v3.13.6)

* Update lock

Author: nachogarcia

package-lock.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "chalk": "^2.4.1",
     "maxmin": "^2.1.0",
-    "uglify-js": "^3.13.3",
+    "uglify-js": "^3.13.10",
     "uri-path": "^1.0.0"
   },
   "devDependencies": {