Updates for changed to .NET Core 3 (#6)

Startup.cs

@@ -51,12 +51,13 @@ namespace StreamR
             app.UseStaticFiles();
             app.UseCookiePolicy();
 
-            app.UseSignalR(route =>
-            {
-                route.MapHub<StreamHub>("/stream");
-            });
+            app.UseRouting();
 
-            app.UseMvc();
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapRazorPages();
+                endpoints.MapHub<StreamHub>("/stream");
+            });
         }
     }
 }

StreamR.csproj

@@ -5,11 +5,4 @@
     <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
   </PropertyGroup>
 
-
-  <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.App" Version="3.0.0-preview-19075-0444" />
-    <PackageReference Include="Microsoft.AspNetCore.SignalR" Version="3.0.0-preview-19075-0444" />
-    <PackageReference Include="Microsoft.AspNetCore.SignalR.Protocols.MessagePack" Version="3.0.0-preview-19075-0444" />
-  </ItemGroup>
-
 </Project>