Update pilot to support TestFlight changes

* Update _pilot_ to work with new TestFlight changes
* Handle dSYM uploading for HockeyApp
* Remove support for Swift 2.3 in _snapshot_
* Add support for metadataRejected as an app status (#8911) via Fumiya Nakamura
* Typo fix (#8908) via Jeremiah Njoroge
* Updated copyright (#8905) via Andrea Falcone
* Loosen version requirements on CFPropertyList
* Improve subbing tests
* Detect when user has Xcode preferences and load the IDECustomDistributionArchivesLocation

https://github.com/fastlane/fastlane/releases/tag/2.28.0
