Add newsfragment

Author: oremanj

newsfragments/89.bugfix.rst

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+trio-asyncio now cancels any Trio tasks that were started inside a trio-asyncio
+loop (using e.g. :func:`trio_as_aio`) before it allows the trio-asyncio loop
+to close. This should resolve some cases of deadlocks and "RuntimeError: Event loop
+is closed" when an ``async with open_loop():`` block is cancelled.