Merge pull request #56 from yahoo/ci

publish to github package

Merge pull request #55 from yahoo/ci

Downgrade jdk version to 8

Create maven.yml

[maven-release-plugin] copy for tag v0.5.3

[maven-release-plugin] copy for tag v0.5.2

[maven-release-plugin] copy for tag v0.5.1

[maven-release-plugin] copy for tag v0.4.7

[maven-release-plugin] copy for tag v0.4.6

[maven-release-plugin] copy for tag v0.4.5

[maven-release-plugin] copy for tag v0.4.4