Cleanup NuGet.config

Author: smitpatel

NuGet.config

@@ -4,7 +4,8 @@
     <add key="automatic" value="False" />
   </packageRestore>
   <packageSources>
-    <add key="AspNetCore" value="https://dotnet.myget.org/F/aspnetcore-ci-release/api/v3/index.json" />
+    <clear />
+    <add key="AspNetCore" value="https://dotnet.myget.org/F/aspnetcore-master/api/v3/index.json" />
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
   </packageSources>
 </configuration>