Updated CHANGELOG

Updated for Face ID

Fixed rotation layout bug

Updated README and CHANGELOG

Changelog updated, added CONTRIBUTING.md

Fixed subclassing crash

Changed `LTHPasscodeViewControllerStrings` macro to use `[LTHPasscodeViewController class]` instead of `[self class]`

CHANGELOG updated

Fixed setting date in the past disabling the lock

Fixed iPad keyboard hiding

Previously there was no way to bring it back after dismissing it

Added check that new passcode is different