Add v5.1.0 / release-5.1 where it is missing (#5893)#5901

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ti-chi-bot merged 3 commits intopingcap:release-5.0from ti-chi-bot:cherry-pick-5893-to-release-5.0

Jul 1, 2021

+3

Commits on Jul 1, 2021

Add v5.1.0 / release-5.1 where it is missing

dveeden
authored and
ti-chi-bot
committed
Update README.md

TomShawn
authored and
ti-chi-bot
committed
Update CONTRIBUTING.md

TomShawn
authored and
ti-chi-bot
committed