Removed redundant code

Merge pull request rolandleth#200 from jnavarrom/master

Avoid a crash in iOS 13

Merge pull request rolandleth#198 from jnavarrom/master

Remove the string "Enter Passcode", it is not used

Revert "Use the latest LAPolicy for iOS9+ which allows a fallback to …

…using the device pin code"

This reverts commit 98f6378.

Updated CHANGELOG

Updated for Face ID

Fixed rotation layout bug

Updated README and CHANGELOG

Changelog updated, added CONTRIBUTING.md