[maven-release-plugin] copy for tag v2.7.0

[maven-release-plugin] copy for tag v2.7.0-RC1

[maven-release-plugin] copy for tag v2.6.0

[maven-release-plugin] copy for tag v2.5.0

[maven-release-plugin] copy for tag v2.4.0

releasing v1.8.0

[maven-release-plugin] copy for tag v2.3.0

[maven-release-plugin] copy for tag v2.2.0

[maven-release-plugin] copy for tag v2.1.0

[maven-release-plugin] copy for tag v1.7.0