chore(package): update gitbook-cli to version 2.3.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -56,7 +56,7 @@
     "eslint-plugin-vue": "0.1.1",
     "fakerator": "0.1.1",
     "git-commit-message-convention": "git://github.com/kazupon/git-commit-message-convention.git#065dfffbe2de5f6f16150aac9d4db7fdf5515e56",
-    "gitbook-cli": "2.1.3",
+    "gitbook-cli": "2.3.0",
     "inject-loader": "2.0.1",
     "isparta-loader": "2.0.0",
     "jade": "1.11.0",