Revert NugGet.config

Author: jviau

NuGet.config

@@ -6,6 +6,7 @@
     <add key="Microsoft.Azure.Functions.PowerShellWorker" value="https://azfunc.pkgs.visualstudio.com/e6a70c92-4128-439f-8012-382fe78d6396/_packaging/Microsoft.Azure.Functions.PowerShellWorker/nuget/v3/index.json" />
     <add key="AzureFunctions@internalrelease" value="https://azfunc.pkgs.visualstudio.com/e6a70c92-4128-439f-8012-382fe78d6396/_packaging/AzureFunctions%40internalrelease/nuget/v3/index.json" />
     <add key="AzureFunctionsRelease" value="https://azfunc.pkgs.visualstudio.com/e6a70c92-4128-439f-8012-382fe78d6396/_packaging/AzureFunctionsRelease/nuget/v3/index.json" />
+    <add key="AzureFunctionsPreRelease" value="https://azfunc.pkgs.visualstudio.com/e6a70c92-4128-439f-8012-382fe78d6396/_packaging/AzureFunctionsPreRelease/nuget/v3/index.json" />
     <add key="AzureFunctionsTempStaging" value="https://azfunc.pkgs.visualstudio.com/e6a70c92-4128-439f-8012-382fe78d6396/_packaging/AzureFunctionsTempStaging/nuget/v3/index.json" />
   </packageSources>
 </configuration>