Updated Nuget.Config source mapping to account for common versioning task.

Author: smaillet

NuGet.Config

@@ -11,6 +11,7 @@
   <packageSourceMapping>
     <packageSource key="nuget.org">
       <package pattern="*" />
+      <package pattern="Ubiquity.NET.Versioning.Build.Tasks" />
     </packageSource>
     <packageSource key="BuildOutput">
       <package pattern="Ubiquity.NET.*" />