update ref assemblies

Author: jkotalik

src/Servers/IIS/IIS/ref/Microsoft.AspNetCore.Server.IIS.netcoreapp3.0.cs

@@ -9,6 +9,7 @@ public IISServerOptions() { }
         public bool AllowSynchronousIO { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } }
         public string AuthenticationDisplayName { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } }
         public bool AutomaticAuthentication { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } [System.Runtime.CompilerServices.CompilerGeneratedAttribute]set { } }
+        public long? MaxRequestBodySize { get { throw null; } set { } }
     }
 }
 namespace Microsoft.AspNetCore.Hosting
@@ -27,6 +28,11 @@ public partial interface IServerVariablesFeature
 }
 namespace Microsoft.AspNetCore.Server.IIS
 {
+    public sealed partial class BadHttpRequestException : System.IO.IOException
+    {
+        internal BadHttpRequestException() { }
+        public int StatusCode { [System.Runtime.CompilerServices.CompilerGeneratedAttribute]get { throw null; } }
+    }
     public static partial class HttpContextExtensions
     {
         public static string GetIISServerVariable(this Microsoft.AspNetCore.Http.HttpContext context, string variableName) { throw null; }