Update NuGet.config

NuGet.config

@@ -2,7 +2,7 @@
 <configuration>
   <packageSources>
 	<clear />
-	<add key="nuget.org" value="https://www.nuget.org/api/v2/" />
+	<add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
   </packageSources>
   <activePackageSource>
 	<add key="All" value="(Aggregate source)" />