Update native return type declaration

Update Dependencie michelf/php-markdown

Merge pull request KnpLabs#115 from bocharsky-bw/symfony6-continue

Symfony 6 continue

Merge pull request KnpLabs#107 from RobinDev/master

Add PHP 8

Merge pull request KnpLabs#102 from abdounikarim/patch-1

Update Twig filters and extension

update phpunit

Merge pull request KnpLabs#96 from mercuryseries/patch-1

Fix small typo

Merge pull request KnpLabs#94 from KnpLabs/remove-templating-dependency

Making the templating component an optional dependency

Adding public alias and autowiring aliases

Updating README to reflect how we do things now

Adding a test case to cover the bug fixed in sha: 8956d7e