Announcing Tornado 6.0.3

[Ben Darnell]

I'm pleased to announce the release of Tornado 6.0.3, available on PyPI. This is a bug fix release that reduces spurious logging and improves compatibility with the upcoming Python 3.8.

https://www.tornadoweb.org/en/branch6.0/releases/v6.0.3.html

What's new in Tornado 6.0.3
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Jun 22, 2019
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Bug fixes
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- `.gen.with_timeout` always treats ``asyncio.CancelledError`` as a
  ``quiet_exception`` (this improves compatibility with Python 3.8,
  which changed ``CancelledError`` to a ``BaseException``).
- ``IOStream`` now checks for closed streams earlier, avoiding
  spurious logged errors in some situations (mainly with websockets).