Support Laravel 9 (#4)

* support php8

* fix travis redis ext

* update travisci

* switch to Github actions

* update readme, add support for L9

* remove L7 from github actions

* add redis to github actions

* forward redis port

* upgrade php cs fixer to v3

v0.2.0 (#3)

* go over readme and license

* minor refactor

* test and fix race condition handling

* update changelog

* remove predis dependency, update changelog

initial release