Setting AppVeyor as the logger/reporter when running build

Author: fabiocav

WebJobs.Script.proj

@@ -143,7 +143,7 @@
       <Output TaskParameter="TargetOutputs" ItemName="UnitTestAssemblies"/>
     </MSBuild>
 
-    <xunit Assemblies="@(UnitTestAssemblies)" ExcludeTraits="$(ExcludedTestTraits)"/>
+    <xunit Assemblies="@(UnitTestAssemblies)" ExcludeTraits="$(ExcludedTestTraits)" Reporter="appveyor"/>
   </Target>
 
   <Target Name="Clean" DependsOnTargets="GetBinplace">