v1.1.0

This release requires at least PHP 8.0.

This is a general refactor cleaning up the code a bit and moving the locking logic from the EtcdLock to the Lock class which doesn't acquire a lock in its constructor. The previous EtcdLock class still exists and works the same as before by extending the Lock class. The new Lock class allows creating a $lock object to read existing locks without immediately acquiring one.