README: update README with new version and and the PREFERRED_PROVIDER_openjdk lines
README: update README with new version and and the PREFERRED_PROVIDER_openjdk lines

rdm-dev/meta-java,rdm-dev/meta-java,tobw/meta-java,Valtis/meta-java,rehsack/meta-java,rdm-dev/meta-java,rehsack/meta-java,rehsack/meta-java,Valtis/meta-java,rehsack/meta-java,tobw/meta-java,woglinde/meta-java,Valtis/meta-java,sunlabtech/meta-java,tobw/meta-java,woglinde/meta-java,rehsack/meta-java,woglinde/meta-java