[maven-release-plugin] prepare release checkstyle-7.8
[maven-release-plugin] prepare release checkstyle-7.8

jonmbake/checkstyle,romani/checkstyle,jochenvdv/checkstyle,checkstyle/checkstyle,romani/checkstyle,jochenvdv/checkstyle,checkstyle/checkstyle,rnveach/checkstyle,sabaka/checkstyle,jonmbake/checkstyle,rnveach/checkstyle,romani/checkstyle,sharang108/checkstyle,sabaka/checkstyle,liscju/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,jochenvdv/checkstyle,sharang108/checkstyle,sabaka/checkstyle,checkstyle/checkstyle,jonmbake/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,liscju/checkstyle,rnveach/checkstyle,rnveach/checkstyle,sharang108/checkstyle,romani/checkstyle,rnveach/checkstyle,liscju/checkstyle,romani/checkstyle