chore(package): update cz-conventional-changelog to version 3.0.3

Closes #12

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "@vue/eslint-config-airbnb": "^4.0.0",
     "commitizen": "^3.1.1",
     "copy-webpack-plugin": "^5",
-    "cz-conventional-changelog": "^2.1.0",
+    "cz-conventional-changelog": "^3.0.3",
     "file-system": "^2.2.2",
     "html-loader": "^0.5.5",
     "node-sass": "^4.12.0",