v5.9.0

Feature

• search: Add search function for playlists (318d524)
• recommendations: Add flow and recommendation functions (a03ac81)

Documentation

• Add Un10ck3d as a contributor for code, doc, and test (#693) (0371bc4)
• Move docs in a single folder (#634) (bb7b3d1)
• Improve links between docs and source code (#632) (7258900)