v1.7.0-BETA.4

TL;DR

• Made winzou/state-machine-bundle optional
• Made symfony/twig-bundle optional

Details

• #202 Remove winzou state machine dependency (@loic425)
• #206 Remove twig bundle dependency (@loic425)
• #207 Bump doctrine/persistance version (@dotdevru)
• #209 [Travis] Use symfony/flex ^1.10 instead of dev-master (@pamil)
• #211 Upgrade to Psalm 4 (@pamil)
• #212 Normalise composer.json (@pamil)
• #213 Update component's composer.json and normalise it (@pamil)