chore(package): update mocha to version 3.0.1 (#55)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -42,7 +42,7 @@
     "babel-preset-es2015": "^6.6.0",
     "babel-register": "^6.7.2",
     "glob": "^7.0.0",
-    "mocha": "^2.3.3",
+    "mocha": "^3.0.1",
     "textlint": "^7.1.0",
     "textlint-tester": "^1.0.0"
   },