chore(package): update uglify-js to version 3.6.4 (#610)

Summary:
## Changelog
Pull Request resolved: https://github.com/facebook/flipper/pull/610

Reviewed By: jknoxville

Differential Revision: D18169272

Pulled By: passy

fbshipit-source-id: ed7c53e5d27053c2d6a881e513d9749cc1d39728

src/plugins/sections/d3/package.json

@@ -57,7 +57,7 @@
     "jsdom": "^15.1.1",
     "seedrandom": "^3.0.5",
     "smash": "0.0",
-    "uglify-js": "^3.6.3",
+    "uglify-js": "^3.6.4",
     "vows": "0.8"
   },
   "scripts": {