Merge pull request morilog#114 from mohsen-hsh74/patch-1

Add PHP 8.0

Merge pull request morilog#93 from reza-akbari/master

fix number of days in last month of leap year

Change min-stablity to dev

Add support for carbon version > 2

Add new test for issue morilog#66

Fix issue morilog#50 - addMonths method

Fix issue morilog#48 for subMonths method

Update php version

Update php version

Update minimum-stablity