Modify uglify-es to uglify-js

Modify uglify-es to uglify-js

Author: cyy641278529

package.json

@@ -39,7 +39,7 @@
     "rollup": "^0.54.1",
     "rollup-plugin-buble": "^0.18.0",
     "scene-graph": "^1.0.4",
-    "uglify-es": "^3.0.15",
+    "uglify-js": "^3.3.7",
     "vmath": "^1.3.1"
   },
   "files": [