chore(package): update commitizen to version 3.0.3

Closes #55

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
     "@commitlint/cli": "^7.0.0",
     "@commitlint/config-conventional": "^7.0.1",
     "JSONStream": "1.3.3",
-    "commitizen": "^2.9.6",
+    "commitizen": "^3.0.3",
     "cz-conventional-changelog": "^2.1.0",
     "eslint": "^5.0.1",
     "eslint-config-finn": "^3.0.0",