Bump gunicorn from 19.8.1 to 19.9.0 (#1520)
Bump gunicorn from 19.8.1 to 19.9.0 (#1520)

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 19.8.1 to 19.9.0.
<details>
<summary>Release notes</summary>

*Sourced from [gunicorn's releases](https://github.com/benoitc/gunicorn/releases).*

> ## 19.9.0
> - fix: address a regression that prevented syslog support from working
>   ([#1668](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1668), [#1773](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1773))
> - fix: correctly set `REMOTE_ADDR` on versions of Python 3 affected by
>   `Python Issue 30205 <https://bugs.python.org/issue30205>`_
>   ([#1755](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1755), [#1796](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1796))
> - fix: show zero response length correctly in access log ([#1787](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1787))
> - fix: prevent raising :exc:`AttributeError` when ``--reload`` is not passed
>   in case of a :exc:`SyntaxError` raised from the WSGI application.
>   ([#1805](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1805), [#1806](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1806))
> - ❗️The internal module ``gunicorn.workers.async`` was renamed to 
>   ``gunicorn.workers.base_async`` since ``async`` is now a reserved word 
>    in Python 3.7.
>   ([#1527](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1527))
</details>
<details>
<summary>Commits</summary>

- [`29f0394`](https://github.com/benoitc/gunicorn/commit/29f0394cdd381df176a3df3c25bb3fdd2486a173) Release version 19.9.0
- [`3e265d4`](https://github.com/benoitc/gunicorn/commit/3e265d43199e4f915cd40ebd0ceebe3d6cf23f65) Regenerate settings documentation
- [`c7c0f9d`](https://github.com/benoitc/gunicorn/commit/c7c0f9db761d741107f89bad01c486e455e3cb37) Update changelog
- [`bd833e0`](https://github.com/benoitc/gunicorn/commit/bd833e0009b8b07d13117f71534eb28e8dc24c5d) Merge pull request [#1796](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1796) from diegoholiveira/1795-rename-async-module
- [`f0c5499`](https://github.com/benoitc/gunicorn/commit/f0c54993caa3e96cc8d0c9ad40c12ba19244992d) Merge branch 'W7PEA-patch-2'
- [`7891310`](https://github.com/benoitc/gunicorn/commit/7891310d806d973801f744e9c100263afd48d55f) Use consistent style in nginx.conf
- [`101f2da`](https://github.com/benoitc/gunicorn/commit/101f2da9223c7de92deb9bdf70dc024bdb7a9a82) Merge branch 'patch-2' of https://github.com/W7PEA/gunicorn into W7PEA-patch-2
- [`d213103`](https://github.com/benoitc/gunicorn/commit/d21310351fefa08e67616a82bac8d425271a4ec1) Optimize by precompiling regex and using tuple for iterable copies.
- [`557b919`](https://github.com/benoitc/gunicorn/commit/557b91964c62242af36ef4994dd8230279981898) Merge branch 'master' into 1795-rename-async-module
- [`21f0adc`](https://github.com/benoitc/gunicorn/commit/21f0adc34617a651f169968869851e34e787f24b) Fix AttributeError when --reload was not passed ([#1806](https://github-redirect.dependabot.com/benoitc/gunicorn/issues/1806))
- Additional commits viewable in [compare view](https://github.com/benoitc/gunicorn/compare/19.8.1...19.9.0)
</details>
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