[maven-release-plugin] prepare release checkstyle-6.4
[maven-release-plugin] prepare release checkstyle-6.4

WonderCsabo/checkstyle,checkstyle/checkstyle,romani/checkstyle,beckerhd/checkstyle,WonderCsabo/checkstyle,ilanKeshet/checkstyle,liscju/checkstyle,jochenvdv/checkstyle,beckerhd/checkstyle,sirdis/checkstyle,llocc/checkstyle,universsky/checkstyle,StetsiukRoman/checkstyle,ilanKeshet/checkstyle,jasonchaffee/checkstyle,izishared/checkstyle,WilliamRen/checkstyle,StetsiukRoman/checkstyle,liscju/checkstyle,designreuse/checkstyle,nikhilgupta23/checkstyle,StetsiukRoman/checkstyle,rnveach/checkstyle,zofuthan/checkstyle-1,sabaka/checkstyle,vboerchers/checkstyle,designreuse/checkstyle,naver/checkstyle,AkshitaKukreja30/checkstyle,zofuthan/checkstyle-1,bansalayush/checkstyle,rmswimkktt/checkstyle,pietern/checkstyle,FeodorFitsner/checkstyle,llocc/checkstyle,ivanov-alex/checkstyle,MEZk/checkstyle,ilanKeshet/checkstyle,checkstyle/checkstyle,pietern/checkstyle,mkordas/checkstyle,nikhilgupta23/checkstyle,romani/checkstyle,baratali/checkstyle,rmswimkktt/checkstyle,jochenvdv/checkstyle,gallandarakhneorg/checkstyle,vboerchers/checkstyle,mkordas/checkstyle,cs1331/checkstyle,romani/checkstyle,MEZk/checkstyle,checkstyle/checkstyle,bansalayush/checkstyle,Bhavik3/checkstyle,attatrol/checkstyle,FeodorFitsner/checkstyle,sabaka/checkstyle,philwebb/checkstyle,ivanov-alex/checkstyle,Bhavik3/checkstyle,liscju/checkstyle,naver/checkstyle,baratali/checkstyle,MEZk/checkstyle,baratali/checkstyle,jonmbake/checkstyle,bansalayush/checkstyle,rnveach/checkstyle,another-dave/checkstyle,gallandarakhneorg/checkstyle,rnveach/checkstyle,Bhavik3/checkstyle,attatrol/checkstyle,romani/checkstyle,pietern/checkstyle,philwebb/checkstyle,gallandarakhneorg/checkstyle,WonderCsabo/checkstyle,autermann/checkstyle,rmswimkktt/checkstyle,nikhilgupta23/checkstyle,AkshitaKukreja30/checkstyle,AkshitaKukreja30/checkstyle,HubSpot/checkstyle,universsky/checkstyle,universsky/checkstyle,jasonchaffee/checkstyle,WilliamRen/checkstyle,jochenvdv/checkstyle,philwebb/checkstyle,rnveach/checkstyle,vboerchers/checkstyle,romani/checkstyle,designreuse/checkstyle,beckerhd/checkstyle,mkordas/checkstyle,Godin/checkstyle,llocc/checkstyle,checkstyle/checkstyle,HubSpot/checkstyle,FeodorFitsner/checkstyle,jonmbake/checkstyle,cs1331/checkstyle,sirdis/checkstyle,jonmbake/checkstyle,another-dave/checkstyle,sharang108/checkstyle,izishared/checkstyle,checkstyle/checkstyle,sharang108/checkstyle,sharang108/checkstyle,jasonchaffee/checkstyle,cs1331/checkstyle,another-dave/checkstyle,izishared/checkstyle,WilliamRen/checkstyle,Godin/checkstyle,autermann/checkstyle,romani/checkstyle,sirdis/checkstyle,attatrol/checkstyle,zofuthan/checkstyle-1,checkstyle/checkstyle,ivanov-alex/checkstyle,rnveach/checkstyle,rnveach/checkstyle,sabaka/checkstyle,autermann/checkstyle,Godin/checkstyle,naver/checkstyle,HubSpot/checkstyle