bump version (#945)
bump version (#945)

Summary: Pull Request resolved: https://github.com/facebookresearch/detectron2/pull/945

Differential Revision: D20097676

Pulled By: ppwwyyxx

fbshipit-source-id: bfa915e6d07122bde5da02ddbe4d01c070ceb115

facebookresearch/detectron2,facebookresearch/detectron2,facebookresearch/detectron2