v0.19.4

Changes 🛠

• added a request timeout of 30s to the default session. Refer to the documentation for how to adjust this timeout: https://ytmusicapi.readthedocs.io/en/latest/reference.html#ytmusicapi.YTMusic.__init__
• search: added category property to search results, which indicates the shelf that the result is a part of. Can be used to identify "top result" type search results

Fixes 🐞

• some housekeeping, removed some deprecated code