[main] Update NuGet feed (#545)

Author: dalexsoto

Diff for: NuGet.config

@@ -4,6 +4,10 @@
 		<add key="repositorypath" value="packages" />
 	</config>
 	<packageSources>
-		<add key="Nuget Official" value ="https://www.nuget.org/api/v2/" />
+		<clear />
+		<add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
 	</packageSources>
+	<disabledPackageSources>
+		<clear />
+	</disabledPackageSources>
 </configuration>