Each pull request title follows the format:
<type>(<scope>): <subject>
Must be one of the following:
feat: A new feature
fix: A bug fix
docs: Documentation only changes
style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
refactor: A code change that neither fixes a bug nor adds a feature
perf: A code change that improves performance
test: Adding missing or correcting existing tests
chore: Changes to the build process or auxiliary tools and libraries such as documentation generation
[from] (https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#commits)