chore(package): update uglify-js to version 3.7.1 (#668)

Summary:
Routine dependency upgrade
Pull Request resolved: https://github.com/facebook/flipper/pull/668

Reviewed By: mweststrate

Differential Revision: D18763830

Pulled By: jknoxville

fbshipit-source-id: 57705079da83a16668e29d6c6bd0da524b7a84f4

src/plugins/sections/d3/package.json

@@ -57,7 +57,7 @@
     "jsdom": "^15.1.1",
     "seedrandom": "^3.0.5",
     "smash": "0.0",
-    "uglify-js": "^3.6.8",
+    "uglify-js": "^3.7.1",
     "vows": "0.8"
   },
   "scripts": {