chore(package): update commitizen to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "ava": "^0.25.0",
     "clear-module": "^3.0.0",
     "codecov": "^3.0.0",
-    "commitizen": "^2.9.6",
+    "commitizen": "^3.0.0",
     "cz-conventional-changelog": "^2.0.0",
     "nock": "^10.0.0",
     "nyc": "^12.0.1",