v5.12.0

Feature

• Add User.create_playlist method (c768a8b)
• Add User.remove_playlist method (289f021)
• Add User.add_playlist method (7ec9bc9)
• Add User.unfollow method (59b9329)
• Add User.follow method (949918a)
• Add User.remove_artist method (70825bf)
• Add User.add_artist method (3ad512b)
• Add User.remove_Track method (ccc7b76)
• Add User.add_track method (1d9d3d2)
• Add User.remove_album method (103c58b)
• Add User.add_album method (013adde)