v3.0.0 - support Symfony 6, drop lesser versions

Merge pull request #21 from martinlutter/symfony6

update to support symfony 6

v2.12.3 Symfony 5 Twig environment

use Twig\Environment instead Twig_Environment (#20)

* fix symfony security threat CVE-2019-10910

* use Twig\Environment instead Twig_Environment

(which is deprecated from v2.7)

https://github.com/twigphp/Twig/issues/3319

v2.12.2 CVE fix + Symfony 5 support

fix symfony security threat CVE-2019-10910 (#19)

v2.12.1 - Symfony 5.0 support

Update dismissible_message.html.twig (#14)

v2.12.0 - php 8 support

allow php 8 (#16)

Symfony 4 compatibility - composer install --optimize-autoloader

Merge pull request #15 from everlutionsk/symfony4-compat

remove abstract get method from AjaxcomTrait

add addAjaxBlock, isAjax methods

Revert "Change URL behavior is now configurable"

This reverts commit 2e9d21c

Symfony 4 service aliases

Merge pull request #12 from everlutionsk/sf4-aliases

Symfony 4 aliases

prepend

s3 trait append, prepend (#11)

* ajaxcomtrait for symfony3

* prepend

* s4 prepend trait

append

Symfony 4 Controller Trait (#7)

* Symfony 4 Controller Trait

* add append (#10)