v9.5.6

• Fixes length, title, and thumbnail_url properties
• Adds author property (thanks @DmitryBurnaev)
• Refactor Stream.order_by(...) for handling ints and speed
• All tests passing (and script to update test mocks/fixtures)
• Adds mypy type hinting to most functions
• Adds Monostate class
• Updates documentation
• Black formatting for all code
• Fixes various misspellings