WooCommerce Cart Notices 1.16.1

* Misc - Add support for WooCommerce 3.3

* Fix - PHP warning when items to hide product in cart and category in cart notices were not set

* Feature - Hide product and category notices when particular items are in the cart
* Tweak - Search for categories with only 2 characters instead of 3
* Misc - Removed support for WooCommerce 2.5
* Localization - Add Slovakian translation (thanks Karol Vörös!)