Ver 2.1.0(2.1.2)

Update gRPC dependency to 1.20.1
Fix StreamingHub receive events only consume one message per frame.
Update SwaggerUI to MagicOnion.HttpGateway
Add Generic Host's DI support to MagicOnion.Hosting
Add MagicOnionHost.CreateDefaultBuilder to MagicOnion.Hosting
Braking Changes, Drop .NET Framework support
Braking Changes, StreamingHubClient.OnBroadcastEvent only supports void

Ver 2.1.2

On NuGet version is 2.1.2, it is same as 2.1.0 but fixed AssemblyFileVersion