Upgrade universalify (#825)

No breaking changes for us, just performance improvements

Author: RyanZim

package.json

@@ -40,7 +40,7 @@
     "at-least-node": "^1.0.0",
     "graceful-fs": "^4.2.0",
     "jsonfile": "^6.0.1",
-    "universalify": "^1.0.0"
+    "universalify": "^2.0.0"
   },
   "devDependencies": {
     "coveralls": "^3.0.0",