Update tag for v8.0.1

Update tag for v8.0.0

Merge pull request #359 from Yang-33/version-7-21

Release 7.21.0

Merge pull request #344 from kkdai/7.20.0

Update version to 7.20.0

Merge pull request #339 from kkdai/7.19.0

Update version to 7.19.0

Merge pull request #329 from kkdai/7.18

Update version to 7.18.0

Merge pull request #325 from kkdai/7.17

Update version to 7.17.0

Merge pull request #315 from kkdai/7.16

Update version to 7.16.0

Merge pull request #312 from kkdai/7.15

Update version to 7.15.0

Merge pull request #308 from kkdai/7.14

Update version to 7.14.0