Allow Symfony 7 (#138)

Remove unused psr/log and stop allowing EOL dependencies.

Merge pull request #129 from slashrsm/symfony_6

Allow Symfony 6.

Fix deprecation

Publish StreamWriterTest (#125)

Replace Travis with GitHub Actions (#124)

Add support for Symfony 5 (#105)

Symfony 4 compatibility. (#65)

Fix namespace

add support for converting to null (#53)