* update dependency, allow php8, switch to GA

* remove travis, fix deprecated php-cs-fixer rule

* fix php-cs-fixer rules, apply php-cs

* add coverage driver

* add PHP8 attribute test

* remove phpunit, use ProphecyTrait

* remove  ProphecyTrait

* upload coverage on php7.4

* remove --no-suggest composer option

* install dedicated phpunit

* exclude phpunit directory

* update changelog

* fix composer cache steps