Update rector/rector requirement from ^0.16.0 || ^0.17.0 || ^0.18.0 to ^0.16.0 || ^0.17.0 || ^0.18.0 || ^0.19.0

Update rector/rector requirement from ^0.16.0 || ^0.17.0 || ^0.18.0 to ^0.16.0 || ^0.17.0 || ^0.18.0 || ^0.19.0 #266