Generate changelog for v2.0.0-BETA.1

Author: Zales0123

CHANGELOG.md CHANGELOG-1.0.mdCHANGELOG.md renamed to CHANGELOG-1.0.md

@@ -0,0 +1,7 @@
+## CHANGELOG FOR `2.0.x`
+
+### v2.0.0-BETA.1 (2022-09-09)
+
+- [#155](https://github.com/Sylius/SyliusMailerBundle/issues/155) Add support for Symfony 6 ([@loic425](https://github.com/loic425))
+- [#164](https://github.com/Sylius/SyliusMailerBundle/issues/164) Remove support for Swiftmailer ([@Zales0123](https://github.com/Zales0123))
+- [#165](https://github.com/Sylius/SyliusMailerBundle/issues/165) Update phpstan/phpstan requirement from 1.7.15 to 1.8.5 ([@dependabot](https://github.com/dependabot)[[@bot](https://github.com/bot)])