fix references

Author: dsyme

.nuget/NuGet.Config

@@ -5,7 +5,9 @@
   </solution>
   <packageSources>  
 
+    <clear />
     <add key="dotnet-core" value="https://www.myget.org/F/dotnet-core/api/v3/index.json" />
+    <add key="nuget.org" value="https://www.nuget.org/api/v2/" />  
 
   </packageSources>  
 </configuration>