Version 0.14.0

Added

• Starlette now officially supports Python3.9.
• In StreamingResponse, allow custom async iterator such as objects from classes implementing __aiter__.
• Allow usage of functools.partial async handlers in Python versions 3.6 and 3.7.
• Add 418 I'm A Teapot status code.

Changed

• Create tasks from handler coroutines before sending them to asyncio.wait.
• Use format_exception instead of format_tb in ServerErrorMiddleware's debug responses.
• Be more lenient with handler arguments when using the requires decorator.