Fixing release NuGet.config

Author: pranavkm

NuGet.Config

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
+    <add key="AspNetVNext" value="https://www.myget.org/F/aspnetrelease/api/v2" />
     <add key="NuGet.org" value="https://nuget.org/api/v2/" />
     <add key="AzureADNighty" value="http://www.myget.org/F/azureadwebstacknightly"/>
   </packageSources>