[maven-release-plugin] prepare release gitlab4j-api-4.19.0 

[maven-release-plugin] prepare release gitlab4j-api-4.18.0 

[maven-release-plugin] prepare release gitlab4j-api-4.17.0 

[maven-release-plugin] copy for tag gitlab4j-api-4.16.0 

[maven-release-plugin] copy for tag gitlab4j-api-4.15.7 

[maven-release-plugin] copy for tag gitlab4j-api-4.15.6 

[maven-release-plugin] copy for tag gitlab4j-api-4.15.5 

[maven-release-plugin] copy for tag gitlab4j-api-4.15.4 

[maven-release-plugin] copy for tag gitlab4j-api-4.15.3 

[maven-release-plugin] copy for tag gitlab4j-api-4.15.2