Haproxy-log-analysis

------------------

- Drop testing on travis-ci.
[gforcada]

- Use GitHub Actions.
[gforcada]

- Format the code with `pyupgrade`, `black` and `isort`.
[gforcada]

- Use `pip-tools` to keep dependencies locked.
[gforcada]

- Bump python versions supported to 3.7-3.11 and pypy.
[gforcada]

- Drop python 3.6 (EOL).
[gforcada]

------------------

- **New command:** ``requests_per_hour``.
Just like the ``requests_per_minute`` but with hour granularity.
Idea and first implementation done by ``valleedelisle``.
[gforcada]

- Fix parsing truncated requests.
Idea and first implementation by ``vixns``.
[gforcada]

------------------

**BREAKING CHANGES:**

- Complete rewrite to use almost no memory usage even on huge files.
[gforcada]

- Add parallelization to make parsing faster by parsing multiple lines in parallel.
[gforcada]

- Rename command ``counter_slow_requests`` to ``slow_requests_counter``,
so it is aligned with all other ``_counter`` commands.
[gforcada]

- Changed the ``counter_invalid`` command to a new command line switch ``--invalid``.
[gforcada]

**Regular changes:**

- Drop Python 2 support, and test on Python 3.8.
[gforcada]

- Remove the pickling support.
[gforcada]

- Add `--json` output command line option.
[valleedelisle]

------------------

- Fix spelling.
[EdwardBetts]

- Make ip_counter use client_ip per default.
[vixns]

- Overhaul testing environment. Test on python 3.7 as well. Use black to format.
[gforcada]

----------------
- Enforce QA checks (flake8) on code.
All code has been updated to follow it.
[gforcada]

- Support Python 3.6.
[gforcada]

- Support different syslog timestamps (at least NixOS).
[gforcada]

------------------

- Improve performance for ``cmd_print``.
[kevinjqiu]