Update DateTime.php

Add github action badge

Version 2.2.0

Merge pull request #30 from andegna/develop

bump up z version since am breaking compatibility

merged some cleanup codes (#25)

* removed implicit variadic function
* added some comments
* tiny code formatting
* Apply fixes from StyleCI (#24)

official v2.0

Suppoerted PHP 7 (#14)

- Suppoerted PHP 7
- Added a Scrutinizer badge

Fixed my email address

Added StyleCI badge