Update release/dev16.4 version to -beta4
Update release/dev16.4 version to -beta4
sharwell/roslyn,bartdesmet/roslyn,abock/roslyn,CyrusNajmabadi/roslyn,reaction1989/roslyn,brettfo/roslyn,genlu/roslyn,stephentoub/roslyn,KevinRansom/roslyn,davkean/roslyn,diryboy/roslyn,jmarolf/roslyn,brettfo/roslyn,tmat/roslyn,davkean/roslyn,KevinRansom/roslyn,wvdd007/roslyn,jasonmalinowski/roslyn,AmadeusW/roslyn,reaction1989/roslyn,CyrusNajmabadi/roslyn,genlu/roslyn,bartdesmet/roslyn,weltkante/roslyn,mgoertz-msft/roslyn,davkean/roslyn,AlekseyTs/roslyn,tannergooding/roslyn,gafter/roslyn,abock/roslyn,eriawan/roslyn,jasonmalinowski/roslyn,heejaechang/roslyn,agocke/roslyn,ErikSchierboom/roslyn,ErikSchierboom/roslyn,KirillOsenkov/roslyn,AlekseyTs/roslyn,mgoertz-msft/roslyn,mavasani/roslyn,KirillOsenkov/roslyn,tannergooding/roslyn,aelij/roslyn,stephentoub/roslyn,shyamnamboodiripad/roslyn,diryboy/roslyn,stephentoub/roslyn,diryboy/roslyn,mavasani/roslyn,gafter/roslyn,tannergooding/roslyn,KevinRansom/roslyn,eriawan/roslyn,heejaechang/roslyn,panopticoncentral/roslyn,gafter/roslyn,abock/roslyn,physhi/roslyn,brettfo/roslyn,weltkante/roslyn,weltkante/roslyn,dotnet/roslyn,tmat/roslyn,tmat/roslyn,shyamnamboodiripad/roslyn,dotnet/roslyn,jmarolf/roslyn,aelij/roslyn,AmadeusW/roslyn,physhi/roslyn,wvdd007/roslyn,AmadeusW/roslyn,sharwell/roslyn,eriawan/roslyn,reaction1989/roslyn,mavasani/roslyn,dotnet/roslyn,panopticoncentral/roslyn,jmarolf/roslyn,physhi/roslyn,agocke/roslyn,panopticoncentral/roslyn,AlekseyTs/roslyn,bartdesmet/roslyn,shyamnamboodiripad/roslyn,aelij/roslyn,CyrusNajmabadi/roslyn,ErikSchierboom/roslyn,genlu/roslyn,wvdd007/roslyn,jasonmalinowski/roslyn,KirillOsenkov/roslyn,mgoertz-msft/roslyn,sharwell/roslyn,heejaechang/roslyn,agocke/roslyn