v2.2.0

Added

• Added support for Guzzle 6 in goutte driver.

Changed

• Start sessions only, when somebody requests them.
• Allow using PHPUnit 4.x or PHPUnit 5.x and Symfony 3.0.
• Dependency on Pimple is removed, which allowed library to be used on projects using any of Pimple version (even 1.0) themselves.