Use conventional commits

[Chalarangelo]

From v2 onwards, we will be using conventional commits. This will help with generating changelogs etc. Additionally, all work will be done on the v2 trunk using feature branches and they will be rebase-merged in all cases, effectively removing any and all merge commits from the trunk. We shall adhere to this convention for all future changes, too.

Commit types

Commit Type	Title	Description	Emoji
feat	Features	A new feature	✨
fix	Bug Fixes	A bug Fix	🐛
docs	Documentation	Documentation only changes	📚
style	Styles	Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)	💎
refactor	Code Refactoring	A code change that neither fixes a bug nor adds a feature	📦
perf	Performance Improvements	A code change that improves performance	🚀
test	Tests	Adding missing tests or correcting existing tests	🚨
build	Builds	Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)	🛠
ci	Continuous Integrations	Changes to our CI configuration files and scripts (example scopes: Travis, Circle, BrowserStack, SauceLabs)	⚙️
chore	Chores	Other changes that don't modify src or test files	♻️
revert	Reverts	Reverts a previous commit	🗑

Source