Second and last beta release of version 2.0.0.
What's Changed
* Added tests for the library, and fixed some found issues by EGJ-Moorington in https://github.com/EGJ-Moorington/CircuitPython_Button_Handler/pull/7
**Full Changelog**: https://github.com/EGJ-Moorington/CircuitPython_Button_Handler/compare/2.0.0-beta.1...2.0.0-beta.2