chore(package): update commitizen to version 3.0.5

Closes #42

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "babel-preset-es2015": "^6.24.0",
     "babel-preset-stage-2": "^6.22.0",
     "codecov.io": "^0.1.6",
-    "commitizen": "^2.9.5",
+    "commitizen": "^3.0.5",
     "cz-conventional-changelog": "^2.0.0",
     "eslint": "^3.19.0",
     "eslint-config-airbnb": "^15.0.1",