Update coverage to 6.4

[pyup-bot]

This PR updates coverage from 6.3.2 to 6.4.

Changelog

6.4

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

- A new setting, :ref:`config_run_sigterm`, controls whether a SIGTERM signal
handler is used.  In 6.3, the signal handler was always installed, to capture
data at unusual process ends.  Unfortunately, this introduced other problems
(see `issue 1310`_).  Now the signal handler is only used if you opt-in by
setting ``[run] sigterm = true``.

- Small changes to the HTML report:

- Added links to next and previous file, and more keyboard shortcuts: ``[``
 and ``]`` for next file and previous file; ``u`` for up to the index; and
 ``?`` to open/close the help panel.  Thanks, `J. M. F. Tsang
 <pull 1364_>`_.

- The timestamp and version are displayed at the top of the report.  Thanks,
 `Ammar Askar <pull 1354_>`_. Closes `issue 1351`_.

- A new debug option ``debug=sqldata`` adds more detail to ``debug=sql``,
logging all the data being written to the database.

- Previously, running ``coverage report`` (or any of the reporting commands) in
an empty directory would create a .coverage data file.  Now they do not,
fixing `issue 1328`_.

- On Python 3.11, the ``[toml]`` extra no longer installs tomli, instead using
tomllib from the standard library.  Thanks `Shantanu <pull 1359_>`_.

- In-memory CoverageData objects now properly update(), closing `issue 1323`_.

.. _issue 1310: https://github.com/nedbat/coveragepy/issues/1310
.. _issue 1323: https://github.com/nedbat/coveragepy/issues/1323
.. _issue 1328: https://github.com/nedbat/coveragepy/issues/1328
.. _issue 1351: https://github.com/nedbat/coveragepy/issues/1351
.. _pull 1354: https://github.com/nedbat/coveragepy/pull/1354
.. _pull 1359: https://github.com/nedbat/coveragepy/pull/1359
.. _pull 1364: https://github.com/nedbat/coveragepy/pull/1364


.. _changes_633:

6.3.3

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

- Fix: Coverage.py now builds successfully on CPython 3.11 (3.11.0b1) again.
Closes `issue 1367`_.  Some results for generators may have changed.

.. _issue 1367: https://github.com/nedbat/coveragepy/issues/1367


.. _changes_632:

Links

• PyPI: https://pypi.org/project/coverage
• Changelog: https://pyup.io/changelogs/coverage/
• Repo: https://github.com/nedbat/coveragepy

[pyup-bot]

Closing this in favor of #258