0.9

• Updated for PHPStan 0.9
• Dynamic return type extension for EntityRepository methods via a generic type created by EntityManager::getRepository() (5fa20b8)
• EntityManager methods should rather return mixed than the documented object typehint (a8fd4a5)
• Support ObjectManager interface (84dd833) - #15, thanks @JanTvrdik!
• Add tests for existing extensions - #12, thanks @vhenzl!