chore(package): update commitizen to version 2.9.6

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "word-wrap": "^1.0.3"
   },
   "devDependencies": {
-    "commitizen": "2.9.5",
+    "commitizen": "2.9.6",
     "semantic-release": "^6.3.2"
   },
   "czConfig": {