Update waitress to 1.0.0

[pyup-bot]

There's a new version of waitress available.
You are currently using 0.9.0. I have updated it to 1.0.0

Changelog

1.0.0

---

Bugfixes

- Removed `AI_ADDRCONFIG` from the call to `getaddrinfo`, this resolves an
 issue whereby `getaddrinfo` wouldn't return any addresses to `bind` to on
 hosts where there is no internet connection but localhost is requested to be
 bound to. See https://github.com/Pylons/waitress/issues/131 for more
 information.

Deprecations

• Python 2.6 is no longer supported.

Features

- IPv6 support

- Waitress is now able to listen on multiple sockets, including IPv4 and IPv6.
 Instead of passing in a host/port combination you now provide waitress with a
 space delineated list, and it will create as many sockets as required.

 .. code-block:: python

  from waitress import serve
  serve(wsgiapp, listen='0.0.0.0:8080 [::]:9090 *:6543')

Security

• Waitress will now drop HTTP headers that contain an underscore in the key
  when received from a client. This is to stop any possible underscore/dash
  conflation that may lead to security issues. See
  Prevent header spoofing via underscore/dash conflation. Pylons/waitress#80 and
  https://www.djangoproject.com/weblog/2015/jan/13/security/

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖