Release of version 8.8.1 of Abacre Hotel Management System

Released: Abacre Hotel Management System v8.8.1.

The main feature of this update is support of door lock system (doors with electronic locks) from Joney Technology Co.
Now it's possible to issue a guest card with expiration card equals to checkout date, read guest card information and erase guest card.

The list of changes:

* Feature: added support of a door lock system. Read more:
https://www.abacre.com/p/door-lock-system
* Feature: added hotel's Check Out Time on menu Configuration - Preferences - Hotel.
* Feature: added hotel's Check In Time on menu Configuration - Preferences - Hotel.