remove duplicate babel-code-frame dependency (#778)

Author: douglasduteil

package.json

@@ -148,7 +148,6 @@
     "update-notifier": "^0.6.0"
   },
   "devDependencies": {
-    "babel-code-frame": "^6.7.5",
     "cli-table2": "^0.2.0",
     "coveralls": "^2.11.4",
     "delay": "^1.3.0",