* bugfix: caching mechanism in 'is_fresh' function ~> thanks to antorweep1987_
* improve examples
.. _antorweep1987: https://github.com/antorweep1987
.. _mbambas: https://github.com/mbambas
.. _lucadelu: https://github.com/lucadelu
.. _kurisuke: https://github.com/kurisuke
.. _knightsamar: https://github.com/knightsamar