Yamicache

------------------

* Removing debug `print()`

------------------

* Adding mypy stub files to distribution

------------------

* Bump Python version to 3.11
* Adding type hints

------------------

* Remove support for Python 2.

------------------

* Fix 8: Function default arguments were not handled. There was also a
potential cache miss if Python changed the order of `dict` keys.

------------------

* Fix 7: Timed-out values are not returned when refreshed