STYLE add indentation to poweshell snippet for readability

appveyor.yml

@@ -86,7 +86,7 @@ install:
   - ps: if ($env:APPVEYOR_PULL_REQUEST_NUMBER -and $env:APPVEYOR_BUILD_NUMBER -ne ((Invoke-RestMethod `
         https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG/history?recordsNumber=50).builds | `
         Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
-        throw "There are newer queued builds for this pull request, failing early." }
+          throw "There are newer queued builds for this pull request, failing early." }
   - ECHO "Filesystem root:"
   - ps: "ls \"C:/\""