BREAKING: Remove .NET Core 3.0 and .NET Core 2.2 support #118
Description
Remove .NET Core 3.0 and 2.2 as they are out of support.
Remove obsolete classes
Alphacloud.MessagePack.AspNetCore.Formatters.MessagePackMvcBuilderExtensions- useIServiceCollection.AddMessagePack()instead of removedIMvcBuilder.AddMessagePackFormatters()orIMvcCoreBuilder.AddMessagePackFormatters()