Merge pull request #24 from artoroz/master

Added phpstan and fixed issues till level 6

Merge pull request #12 from pulzarraider/microseconds

Add support for microseconds

Merge pull request #10 from Ydalb/feature-zerofill

#7 Adding zerofill feature in formatted() function

Merge pull request #9 from AntonLazarev/leading_zero

Added leading zero for "9" minutes and seconds

Merge pull request #5 from dimitri-koenig/feature/toMinutes

Added toMinutes() method #4

Added PHPDocs

Adding null params to methods

Initial Release