v2.9.1.1

[maven-release-plugin] copy for tag v2.9.1.1

v2.8.2.1

[maven-release-plugin] copy for tag v2.8.2.1

v1.0.0-20201206-rc

Fix the problem that batchMessageId is converted to messageIdImpl (Pu…

v1.0.0-20201204-rc

Update doc