snapshot improvements and more

* Add _snapshot_ support for iPhone X and new tvOS (#10346) via Julien Quéré
* Fix download_dsyms.rb ‘latest’ (#10337) via David Whetstone
* [fix] slather.rb option source_files type is Array not String (#10333) via Demo
* [snapshot] Delete simulators based on versions (#10215) via Joseph Petersen
* [supply] Fix crash in apks_version_codes (#10330) via David Ohayon
* Make xcode_9 hard failure a warning (#10326) via Jacob Aleksynas
* Set the original name for the uploaded ipa (#10248) via Christian
* Fix creation of certificate when a keychain is specified. (#10321) via Typz
* [deliver] Add supply's `android` folder to list of excluded directories for language check (#10267) via Jan Piotrowski
* Fixed wrong working directory in cocoapods.error_callback call (#10309) via Siarhei Fiedartsou
* [snapshot] excludes helpers in assets when finding helpers (#10212) via Yusuke Hosonuma

https://github.com/fastlane/fastlane/releases/tag/2.57.0
