Update pytest-watch to 4.2.0

[pyup-bot]

This PR updates pytest-watch from 4.1.0 to 4.2.0.

Changelog

4.2.0

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

- Enhancement: Show timestamp before running py.test ([66](https://github.com/joeyespo/pytest-watch/pull/66) - thanks, [xsteve][]!)
- Enhancement: Add watch single file feature ([80](https://github.com/joeyespo/pytest-watch/pull/80) - thanks, [touilleMan][]!)
- Bugfix: Add more common cache directories to `.gitignore`
- Bugfix: Handle SystemExit also when calling _run_pytest_collect ([60](https://github.com/joeyespo/pytest-watch/pull/60) - thanks, [blueyed][]!)
- Bugfix: Wait for pdb if it's passed to `pytest_args` ([64](https://github.com/joeyespo/pytest-watch/pull/64) - thanks, [remcohaszing][]!)
- Bugfix: Use the same Python interpreter for `pytest` when `ptw` is run outside of an activated virtual environment ([72](https://github.com/joeyespo/pytest-watch/pull/72) - thanks, [jacebrowning][]!)
- Bugfix: Fix `TypeError: can only concatenate tuple (not "list") to tuple`
- Bugfix: Show output when pytest is interrupted on config collection (dac01e9e585176c1da55b5588bdf86c8dd016c22) and document pytest exit code ([90](https://github.com/joeyespo/pytest-watch/pull/90) - thanks, [asford][]!)
- Readme: Add full command-line usage
- Readme: Add `README.rst` for better-looking README on PyPI ([83](https://github.com/joeyespo/pytest-watch/pull/83) - thanks, [apast][]!)
- Readme: Remove Gratipay :frowning_face: ([Article](https://gratipay.news/the-end-cbfba8f50981))
- Readme: Add [Say Thanks](http://saythanks.io/) badge :smiley:

Links

• PyPI: https://pypi.org/project/pytest-watch
• Changelog: https://pyup.io/changelogs/pytest-watch/
• Repo: http://github.com/joeyespo/pytest-watch

[codecov]

Codecov Report

Merging #58 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #58   +/-   ##
=======================================
  Coverage   93.61%   93.61%           
=======================================
  Files           7        7           
  Lines         141      141           
=======================================
  Hits          132      132           
  Misses          9        9

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