SF4 compatibility

Fixed YAML format to be compatible with SF4. See #6

Improved YAML format

Fix yaml format

Fixes "User Deprecated: Not quoting the scalar "%hpatoio_bitly.access_token%" starting with the "%" indicator character is deprecated since Symfony 3.1 and will throw a ParseException in 4.0. " deprecation warnings

Service name format improvement

Merge pull request #4 from kissifrot/patch-3

Fix monolog_service.yml

Symfony3 compatibility

Merge pull request #3 from kissifrot/patch-1

Add support for symfony 3.x