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[VOTE] Release Apache Aurora 0.20.0 RC0

All, I propose that we accept the following release candidate as the official Apache Aurora 0.20.0 release. Aurora 0.20.0-rc0 includes the following: --- The RELEASE NOTES for the release are available at: https://git-wip-us.apache.org/repos/asf?p=aurora.git=RELEASE-NOTES.md=rel/0.20.0-rc0 The