Merge pull request #1907 from chrisamanse/patch-1

Update ignore for fastlane files in Swift

Swift.gitignore

@@ -58,4 +58,6 @@ Carthage/Build
 # https://github.com/fastlane/fastlane/blob/master/docs/Gitignore.md
 
 fastlane/report.xml
+fastlane/Preview.html
 fastlane/screenshots
+fastlane/test_output