Insight (#17)

* fix symfony insight warnings

* insight badge

* fix symfony insight warnings

* fix symfony insight warnings

* fix symfony insight warnings

* Prepare for symfony 5 and PHP8

* TravisCI: Removed min-stablity beta, use deps high and low

* Added low for 7.4 and 8.0

* Fix dependencies and improve travisci config

* Raised PHPUnit version

* Added XDEBUG_MODE=coverage

* Fix coveralls script name

* Allow deprecations

fix services so that you can type-hint to inject services

fix homepage link

fix services so that you can type-hint to inject services

fix homepage link

Added LifecycleEventsDispatcher::getDispatcher() that returns Sf's di…