Add CHANGELOG

Rename g1a/composer-test-scenarios

Test Symfony version 2, 3 and 4 with different versions of php.

Support for Symfony 4.

Minor updates only.

Remove unused components in composer.json.

Update branch alias for dev-master, and add a LICENSE file.

Tag stable release.

Make sure that we always use our accessor method $this->getLogOutputS…

…tyler() in Logger.

Label and message styles need to encompass all valid log levels now.