Added 'EnsureWixToolsetInstalled' BeforeTarget to GetVersionTask.targets

Author: Forest Balk

src/GitVersionTask/NugetAssets/build/GitVersionTask.targets

@@ -67,7 +67,7 @@
     </ItemGroup>
   </Target>
 
-  <Target Name="GetVersion" BeforeTargets="CoreCompile;GetAssemblyVersion;GenerateNuspec;_GenerateRestoreProjectSpec" Condition="$(GetVersion) == 'true'">
+  <Target Name="GetVersion" BeforeTargets="CoreCompile;GetAssemblyVersion;GenerateNuspec;_GenerateRestoreProjectSpec;EnsureWixToolsetInstalled" Condition="$(GetVersion) == 'true'">
 
     <GetVersion SolutionDirectory="$(GitVersionPath)" NoFetch="$(GitVersion_NoFetchEnabled)">
       <Output TaskParameter="Major" PropertyName="GitVersion_Major" />