Set master prerelease version to beta3
Set master prerelease version to beta3

CyrusNajmabadi/roslyn,ErikSchierboom/roslyn,panopticoncentral/roslyn,AlekseyTs/roslyn,heejaechang/roslyn,bartdesmet/roslyn,abock/roslyn,jmarolf/roslyn,abock/roslyn,DustinCampbell/roslyn,sharwell/roslyn,jasonmalinowski/roslyn,KirillOsenkov/roslyn,jmarolf/roslyn,tmat/roslyn,davkean/roslyn,mavasani/roslyn,jcouv/roslyn,agocke/roslyn,stephentoub/roslyn,AlekseyTs/roslyn,KevinRansom/roslyn,dotnet/roslyn,brettfo/roslyn,tannergooding/roslyn,aelij/roslyn,aelij/roslyn,davkean/roslyn,AmadeusW/roslyn,sharwell/roslyn,reaction1989/roslyn,jasonmalinowski/roslyn,CyrusNajmabadi/roslyn,brettfo/roslyn,VSadov/roslyn,DustinCampbell/roslyn,diryboy/roslyn,genlu/roslyn,tannergooding/roslyn,swaroop-sridhar/roslyn,diryboy/roslyn,shyamnamboodiripad/roslyn,gafter/roslyn,AlekseyTs/roslyn,KevinRansom/roslyn,CyrusNajmabadi/roslyn,abock/roslyn,gafter/roslyn,eriawan/roslyn,nguerrera/roslyn,genlu/roslyn,jcouv/roslyn,sharwell/roslyn,physhi/roslyn,weltkante/roslyn,weltkante/roslyn,mgoertz-msft/roslyn,agocke/roslyn,dotnet/roslyn,nguerrera/roslyn,davkean/roslyn,AmadeusW/roslyn,panopticoncentral/roslyn,mgoertz-msft/roslyn,jcouv/roslyn,wvdd007/roslyn,brettfo/roslyn,genlu/roslyn,ErikSchierboom/roslyn,nguerrera/roslyn,MichalStrehovsky/roslyn,mavasani/roslyn,gafter/roslyn,wvdd007/roslyn,tmat/roslyn,tannergooding/roslyn,DustinCampbell/roslyn,agocke/roslyn,heejaechang/roslyn,swaroop-sridhar/roslyn,heejaechang/roslyn,KirillOsenkov/roslyn,mavasani/roslyn,bartdesmet/roslyn,ErikSchierboom/roslyn,reaction1989/roslyn,KirillOsenkov/roslyn,eriawan/roslyn,stephentoub/roslyn,AmadeusW/roslyn,VSadov/roslyn,VSadov/roslyn,MichalStrehovsky/roslyn,eriawan/roslyn,MichalStrehovsky/roslyn,physhi/roslyn,aelij/roslyn,jmarolf/roslyn,jasonmalinowski/roslyn,wvdd007/roslyn,shyamnamboodiripad/roslyn,mgoertz-msft/roslyn,bartdesmet/roslyn,weltkante/roslyn,dotnet/roslyn,swaroop-sridhar/roslyn,physhi/roslyn,stephentoub/roslyn,KevinRansom/roslyn,diryboy/roslyn,tmat/roslyn,shyamnamboodiripad/roslyn,panopticoncentral/roslyn,reaction1989/roslyn