Add a CHANGELOG.md file

[fiznool]

Thanks for a great library, its really useful to reset the state of a project, especially when fiddly iOS-based build issues occur!

I notice that 4.0.0 has recently been released, but its not immediately obvious why the major version has been bumped. A changelog would really help users such as myself to understand changes before committing to installing a new version.

There is more information on the best practices around changelogs at https://keepachangelog.com. It would be great to see this library adopt a changelog!

[pmadruga]

Completely agree, and thanks for raising this! It's now on my to-do list.