Bump to PHP 8 (#3)

* Bump to PHP 8
* Drop everything below PHP 7.2
* Update PHPUnit

Initial adjustments after forking (#2)

* Add .idea folder to gitignore

* Adjust bundle name and urls in composer.json

* Add Github workflow to run tests

* Remove unneeded config files of original library

* Update license

See https://gist.github.com/fbaierl/1d740a7925a6e0e608824eb27a429370

Release v0.7.0

Release v0.6.0

Release v0.5.0

Release v0.4.1

Release v0.4.0

Release v0.3.0

Add type hints for all class properties

Fix @Covers in MoneyTest