requirements: trying again to fix protobuf-py3
requirements: trying again to fix protobuf-py3

Former-commit-id: 79968eec112d66ccbffab52d999e89db23338999
tmfoltz/worldengine,psi29a/worldengine,sylvanmist/worldengine,MM1nd/worldengine,esampson/worldengine,tmfoltz/worldengine,Mindwerks/worldengine,psi29a/worldengine,MM1nd/worldengine,esampson/worldengine,Mindwerks/worldengine,sylvanmist/worldengine