Not usable in a Symfony 2.8 environment

[cfoehrdes]

We tried to use pattern lab twig edition in a symfony 2.8 environment (which is the current long term release). We are not able to install it via composer because the patternlab-php-core is restricted to symfony 2.6 (due to restriction to the symfony/filesystem component ~2.6.4 in core version 2.4.1) or ^3.0 in the current core version.

I would suggest to add 2.8 support by adding it to the symfony component version constraints (e.g. ^2.8|^3.0) in the current patternlab-php-core composer package.

If you are ok with it, I would test the core in our 2.8 env and create a pull request with the composer.json change.

[KRav007]

We would like to use it in Symfony 2.8, too.