Changed the maven compiler flag to use the release flag instead to co…

[endoplasmicR]

…rrectly set the JDK bootclasspath

[endoplasmicR]

@cyrille-leclerc @billonahill
Was still running into the JDK error since the artifact is build using JDK15.
I have verified this build locally using mvn clean install
see
https://stackoverflow.com/questions/43102787/what-is-the-release-flag-in-the-java-9-compiler
for the release flag usage

[cyrille-leclerc]

Thank you very much @endoplasmicR .
Please test https://github.com/jmxtrans/jmxtrans-agent/releases/tag/jmxtrans-agent-1.2.11-rc-4

[endoplasmicR]

Thank you very much @endoplasmicR .
Please test https://github.com/jmxtrans/jmxtrans-agent/releases/tag/jmxtrans-agent-1.2.11-rc-4

hi, @cyrille-leclerc I have tested it out and it is looking good. can you please create a minor version release?

Thank you.

[cyrille-leclerc]

Thanks @endoplasmicR . Here is the release: https://github.com/jmxtrans/jmxtrans-agent/releases/tag/jmxtrans-agent-1.2.11