0.23.0 (UNRELEASED)

This release is backwards-compatible with v0.21.
Changes are non-breaking, unless you upgrade from v0.22.

• BREAKING: The asyncio_event_loop mark has been removed. Event loops with class, module, package, and session scopes can be requested via the scope keyword argument to the asyncio mark.
• Introduces the event_loop_policy fixture which allows testing with non-default or multiple event loops #662
• Removes pytest-trio from the test dependencies #620