Update reference assemblies for health checks.

Author: CBaud

src/Middleware/HealthChecks/ref/Microsoft.AspNetCore.Diagnostics.HealthChecks.netcoreapp3.0.cs

@@ -16,6 +16,7 @@ public static partial class HealthCheckEndpointRouteBuilderExtensions
     {
         public static Microsoft.AspNetCore.Builder.IEndpointConventionBuilder MapHealthChecks(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder builder, string pattern) { throw null; }
         public static Microsoft.AspNetCore.Builder.IEndpointConventionBuilder MapHealthChecks(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder builder, string pattern, Microsoft.AspNetCore.Diagnostics.HealthChecks.HealthCheckOptions options) { throw null; }
+        public static Microsoft.AspNetCore.Builder.IEndpointConventionBuilder MapHealthChecks(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder builder, string pattern, Microsoft.AspNetCore.Diagnostics.HealthChecks.HealthCheckOptions options, string displayName) { throw null; }
     }
 }
 namespace Microsoft.AspNetCore.Diagnostics.HealthChecks