Update NuGet.Config

Author: huangxiangyao

NuGet.Config

@@ -4,6 +4,5 @@
     <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
     <add key="myvas-dev" value="https://www.myget.org/F/myvas-dev/api/v3/index.json" />
-    <add key="aspnetcore-dev" value="http://dotnet.myget.org/F/aspnetcore-dev/api/v3/index.json" />
   </packageSources>
 </configuration>