update license

Remove ping method redifining (#4)

* remove ping method redifining

* add more php versions to ci

* use github actions

* add redis to ci

* update phpunit, remove old php versions

* more ci fixes

* add badges

Change namespace (#3)

* chage namespace

* readme minor fixes

Merge pull request #3 from dcb9/addTests

Add tests

Add docs, travis and codeclimate