chore(package): update commitizen to version 3.0.5

Closes #10

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
   ],
   "devDependencies": {
     "chai": "^4.1.2",
-    "commitizen": "^2.9.6",
+    "commitizen": "^3.0.5",
     "coveralls": "^3.0.0",
     "cz-conventional-changelog": "^2.0.0",
     "istanbul": "^0.4.5",