Merge pull request tensorflow#1783 from minglotus-6/releng_20201209_1…

…01238

Update version for 2.4.0-rc4 release.

Merge pull request tensorflow#1777 from shadowdragon89/releng_2020120…

…1_184636

Update version for 2.4.0-rc3 release.

Merge pull request tensorflow#1772 from shadowdragon89/cp_r2.4_202011…

…20_141553

Fix release script

Merge pull request tensorflow#1716 from yimingz-a/releng_20200810_162535

Update version for 2.3.0 release.

Merge pull request tensorflow#1713 from minglotus-6/build

Remove build rule for non-existing file.

Merge pull request tensorflow#1656 from nrobeR/releng_20200602_221824

Update version for 2.2.0 release.

Merge pull request tensorflow#1599 from minglotus-6/releng_20200415_1…

…75136

Update version for 2.2.0-rc1 release.

Merge pull request tensorflow#1599 from minglotus-6/releng_20200415_1…

…75136

Update version for 2.2.0-rc1 release.

Merge pull request tensorflow#1594 from nrobeR/releng_20200407_175550

Update version for 2.2.0-rc0 release.

Merge pull request tensorflow#1533 from shadowdragon89/releng_2020011…

…4_131435

Update version for 2.1.0 release.