chore(package): update babel-core to version 6.10.4

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -18,7 +18,7 @@
   ],
   "repository": "errorable/common",
   "devDependencies": {
-    "babel-core": "^6.9.1",
+    "babel-core": "^6.10.4",
     "babelify": "^7.2.0",
     "del": "^2.2.1",
     "errorable": "^0.3.1",