update for release notes 6.4
update for release notes 6.4

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