add Pharo2.0 back to lineup to test fix while balancing test loads
add Pharo2.0 back to lineup to test fix while balancing test loads

Metacello/metacello,krono/metacello-work,demarey/metacello-work,seandenigris/metacello-work,StephanEggermont/metacello-work,pharo-project/pharo-metacello,seandenigris/metacello-work,dalehenrich/metacello-work,pharo-project/pharo-metacello,dalehenrich/metacello-work,krono/metacello-work,StephanEggermont/metacello-work,demarey/metacello-work