chore(package): update cz-conventional-changelog to version 3.1.1

Closes #61

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "@commitlint/config-conventional": "^7.0.1",
     "JSONStream": "1.3.3",
     "commitizen": "^2.9.6",
-    "cz-conventional-changelog": "^2.1.0",
+    "cz-conventional-changelog": "^3.1.1",
     "eslint": "^5.0.1",
     "eslint-config-finn": "^3.0.0",
     "eslint-config-finn-prettier": "^3.0.1",