Fix powershell command

Relates to #60

Scripts/README.md

@@ -54,7 +54,7 @@ Location: [C:\Devel\AutoTx\Scripts\build_2019-04-23_14-14-42__3.0-70-gf90a55c]
 To combine the two previous steps in one go, use this command:
 
 ```PowerShell
-.\Scripts\msbuild\build\debug.cmd ; if ($? -eq 0) { .\Scripts\Deploy-NewBuild.ps1 ; }
+.\Scripts\msbuild\build\debug.cmd ; if ($?) { .\Scripts\Deploy-NewBuild.ps1 ; }
 ```
 
 ## Triggering the Updater