Update rector/rector requirement from ^0.17.0 || ^0.19.0 || ^1.0.0 to ^0.17.0 || ^0.19.0 || ^1.0.0 || ^2.0.0

Update rector/rector requirement from ^0.17.0 || ^0.19.0 || ^1.0.0 to ^0.17.0 || ^0.19.0 || ^1.0.0 || ^2.0.0 #82