migrate build on travis to openjdk11

[xcesco]

Sonarcloud will stop support JDK8.

https://www.deps.co/guides/travis-ci-latest-java/

[xcesco]

Version v7 remains on JDK 8. Too many changes on already hard work. Better consolidate and then change the platform.

[xcesco]

In current work I rollback I found the problem was on Roboletric, Jacoco and the report test dependencies.

Remember to consult this article to see how to include aar dependencies in a Maven project.

Nowadays, Kripton need to be compiled with JDK8.