Required version updated

When I try to install this bundle with composer, I have the following error.

      Problem 1
        - browscap/browscap-bundle 1.0.x-dev requires browscap/browscap-php 1.0.*@dev -> no matching package found.
        - browscap/browscap-bundle dev-master requires browscap/browscap-php 1.0.*@dev -> no matching package found.

This PR fixes the problem.
You can also fixe it by adding a tag in `browscap/browscap-php`.