[maven-release-plugin] copy for tag slack-2.3

[maven-release-plugin] copy for tag slack-2.2

[maven-release-plugin] copy for tag slack-2.1

[maven-release-plugin] copy for tag slack-2.0.1

[maven-release-plugin] copy for tag slack-2.0

[maven-release-plugin] copy for tag slack-1.8.1

[maven-release-plugin] copy for tag slack-1.8

[maven-release-plugin] copy for tag slack-1.7

[maven-release-plugin] copy for tag slack-1.6

[maven-release-plugin] copy for tag slack-1.0