Update virtualenv to 20.0.3

[pyup-bot]

This PR updates virtualenv from 16.7.9 to 20.0.3.

Changelog

20.0.3

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Document a programmatic API as ``from virtualenv import cli_run`` under :ref:`programmatic_api` -
by :user:`gaborbernat`. (`1585 <https://github.com/pypa/virtualenv/issues/1585>`_)

20.0.2

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Add link to the `legacy documentation <https://virtualenv.pypa.io/en/legacy>`_ for the changelog by :user:`jezdez`. (`1547 <https://github.com/pypa/virtualenv/issues/1547>`_)
- Fine tune the documentation layout: default width of theme, allow tables to wrap around, soft corners for code snippets
- by :user:`pradyunsg`. (`1548 <https://github.com/pypa/virtualenv/issues/1548>`_)

20.0.1

~~~~~~~~~~~~~~~~~
- Virtual environments created via relative path on Windows creates bad console executables - by :user:`gaborbernat`. (`1552 <https://github.com/pypa/virtualenv/issues/1552>`_)
- Seems sometimes venvs created set their base executable to themselves; we accept these without question, so we handle
virtual environments as system pythons causing issues - by :user:`gaborbernat`. (`1553 <https://github.com/pypa/virtualenv/issues/1553>`_)


v20.0.0. (2020-02-10)
---------------------

Improved Documentation - 20.0.0.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Fixes typos, repeated words and inconsistent heading spacing. Rephrase parts of the development documentation and CLI
documentation. Expands shorthands like ``env var`` and ``config`` to their full forms. Uses descriptions from respective
documentation, for projects listed in ``related links`` - by :user:`pradyunsg`. (`1540 <https://github.com/pypa/virtualenv/issues/1540>`_)

20.0.0b2

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Create the first iteration of the new documentation - by :user:`gaborbernat`. (`1465 <https://github.com/pypa/virtualenv/issues/1465>`_)
- Project readme is now of type MarkDown instead of reStructuredText - by :user:`gaborbernat`. (`1531 <https://github.com/pypa/virtualenv/issues/1531>`_)

20.0.0b1

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

* First public release of the rewrite. Everything is brand new and just added.

.. warning::

The current virtualenv is the second iteration of implementation. From version ``0.8`` all the way to ``16.7.9``
we numbered the first iteration. Version ``20.0.0b1`` is a complete rewrite of the package, and as such this release
history starts from there. The old changelog is still available in the
`legacy branch documentation <https://virtualenv.pypa.io/en/legacy/changes.html>`_.

Links

• PyPI: https://pypi.org/project/virtualenv
• Changelog: https://pyup.io/changelogs/virtualenv/
• Homepage: https://virtualenv.pypa.io/

[EnTeQuAk]

I tried to investigate but couldn't figure out what the issue here is for now.

We're running into

olympia@05efd1e33d3c:/code$ tox -e codestyle
GLOB sdist-make: /code/setup.py
codestyle recreate: /code/.tox/codestyle
codestyle inst: /code/.tox/.tmp/package/3/olympia-0.1.0.zip
WARNING: test command found but not installed in testenv
  cmd: /deps/bin/pip
  env: /code/.tox/codestyle
Maybe you forgot to specify a dependency? See also the whitelist_externals envconfig setting.

DEPRECATION WARNING: this will be an error in tox 4 and above!

issues.

I tried to explicitly make use of python binary to use pip and other tools but that didn't help.

diff --git a/.travis.yml b/.travis.yml
index 6f88d3cdf5..d3348ba737 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -62,7 +62,7 @@ install:
   - nvm deactivate
   - nvm install 8
   - nvm use 8
-  - pip install --no-deps -r requirements/travis_base.txt
+  - python -m pip install --no-deps -r requirements/travis_base.txt
 
 before_script:
   - mysql --version
diff --git a/tox.ini b/tox.ini
index 6a2b2d8e59..8b1e9ffc83 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,39 +12,39 @@ whitelist_externals =
     make
     npm
     bash
-    pytest
+    python

 [testenv:es]
 commands =
     make install_python_test_dependencies
-    pytest -m "es_tests and not needs_locales_compilation and not static_assets" -v src/olympia/ {posargs}
+    python -m pytest -m "es_tests and not needs_locales_compilation and not static_assets" -v src/olympia/ {posargs}

 [testenv:addons-versions-files-ratings]
 commands =
     make install_python_test_dependencies
-    pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/addons/ src/olympia/versions/ src/olympia/files/  src/olympia/ratings/ {posargs}
+    python -m pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/addons/ src/olympia/versions/ src/olympia/files/  src/olympia/ratings/ {posargs}

 [testenv:devhub]
 commands =
     make install_python_test_dependencies install_node_dependencies
-    pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/devhub/ {posargs}
+    python -m pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/devhub/ {posargs}

 [testenv:reviewers-and-zadmin]
 commands =
     make install_python_test_dependencies
-    pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/reviewers/ src/olympia/zadmin/ {posargs}
+    python -m pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/reviewers/ src/olympia/zadmin/ {posargs}

 [testenv:amo-lib-locales-and-signing]
 commands =
     make install_python_test_dependencies install_node_dependencies
-    pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/amo/ src/olympia/lib/ src/olympia/signing {posargs}
+    python -m pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/amo/ src/olympia/lib/ src/olympia/signing {posargs}
     bash {toxinidir}/locale/compile-mo.sh {toxinidir}/locale/
-    pytest -n 2 -m 'needs_locales_compilation' -v src/olympia/ {posargs}
+    python -m pytest -n 2 -m 'needs_locales_compilation' -v src/olympia/ {posargs}

 [testenv:main]
 commands =
     make install_python_test_dependencies install_node_dependencies
-    pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/ \
+    python -m pytest -n 2 -m 'not es_tests and not needs_locales_compilation and not static_assets' -v src/olympia/ \
         --ignore src/olympia/addons/ \
         --ignore src/olympia/devhub/ \
         --ignore src/olympia/files/ \
@@ -61,7 +61,7 @@ commands =
 [testenv:assets]
 commands =
     make update_deps
-    pytest -m "static_assets" -v src/olympia/ {posargs}
+    python -m pytest -m "static_assets" -v src/olympia/ {posargs}

 [testenv:codestyle]
 recreate = True
@@ -71,5 +71,5 @@ commands =

 [testenv:docs]
 commands =
-    pip install --no-deps -r requirements/docs.txt
+    python -m pip install --no-deps -r requirements/docs.txt
     make docs

tox-dev/tox#1516 mentions this but related issues should have been fixed with virtualenv 20.0.3 so this seems to be something else. I wonder if we're doing something weird but I couldn't see anything out of place for now.

[EnTeQuAk]

Closing in favor of #13579