udpate for 6.4 release notes
udpate for 6.4 release notes

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