Bump virtualenv from 15.1.0 to 16.2.0

[dependabot-preview]

Bumps virtualenv from 15.1.0 to 16.2.0.

Changelog

Sourced from virtualenv's changelog.

v16.2.0 (2018-12-31)

Bugfixes
^^^^^^^^

• copyfile handles relative symlinks and symlinks to symlinks, avoiding problems when Python was installed using stow or homebrew. (#268 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/268>_)
• Fix preserving of original path when using fish and a subshell. (#904 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/904>_)
• Drop the source layout of the project, going back to how the source was laid out before 16.1.0. (#1241 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1241>_)
• Fix bootstrap script generation broken with 16.0.0. Support now both CPython, pypy, jython. (#1244 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1244>_)
• lib64 symlink is again relative (as was with < 16.1.0). (#1248 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1248>_)

Features
^^^^^^^^

• fish version 3 support for the activation script. (#1275 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1275>_)
• powershell activator is no longer signed. (#816 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/816>_)
• pyproject.toml with PEP-517 and PEP-518 is now provided. tox.ini is now packaged with the sdist. Distributions repackaging the library should use tox -e py to run the test suite on the sdist. (#909 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/909>_)
• activate_this.py improvements: set VIRTUAL_ENV environment variable; pypy, pypy3 and jython support. (#1057 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1057>_)
• The xonsh <http://xon.sh/index.html>_ shell is now supported by generating the xon.sh activation script. (#1206 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1206>_)
• Support pip wheels with removed certifi's cacert.pem. (#1252 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1252>_)
• Upgrade setuptools from 40.5.0 to 40.6.3 and wheel from 0.32.2 to 0.32.3. (#1257 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1257>_)
• powershell now also provides the pydoc function that uses the virtual environments pydoc. (#1258 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1258>_)
• Migrate to a setup.cfg based build. Minimum setuptools required to build is setuptools >= 40.6.3, this is automatically acquired for all PEP-518 builders (recommended), or acquired via the old setup_requires method otherwise. Move exclusively to a setuptools generated console entry point script, this now does make setuptools >= 18.0.0 a runtime dependency (install requires). Source and issue tracker now is shown on PyPi (supplied as package metadata) beside the homepage. (#1259 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1259>_)

Deprecations (removal in next major release)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

• Using python setup.py test is now marked as deprecated and will be removed in next release. Use tox instead, always. (#909 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/909>_)
• Using the project directly from the source layout is now deprecated. Going ahead people wanting to use the project without installing the virtualenv are encouraged to download the wheel from PyPi and extract it to access the virtualenv.py file. We'll be switching to a src layout with next release. (#1241 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1241>_)
• No longer support distutils build/installation, now setuptools >= 40.6.3 is required. (#1259 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1259>_)

Documentation
^^^^^^^^^^^^^

• activate_this.py recommend exec(open(this_file).read(), {'__file__': this_file}) as it works both on Python 2 and 3. (#1057 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1057>_)
• Clarify how this project relates to the standard libraries venv and when one would still want to use this tool. (#1086 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1086>_)
• Move to a towncrier generated changelog to avoid merge conflicts, generate draft changelog documentation. Prefix version string in changelog with v to make the hyperlinks stable. (#1234 <https://github-redirect.dependabot.com/pypa/virtualenv/issues/1234>_)

v16.1.0 (2018-10-31)

• Fixed documentation to use pypi.org and correct curl options; :issue:1042
• bug fix: ensure prefix is absolute when creating a new virtual environment :issue:1208
• upgrade setuptools from 39.1.0 to 40.5.0
• upgrade wheel from 0.31.1 to 0.32.2
• upgrade pip from 10.0.1 to 18.1

... (truncated)

Commits

• d5fed23 fish 3 compatbility
• 1cf41c5 release 16.2.0
• f4e72e1 fix releae
• 9164aab add release Azure task
• c3c1744 add pytest xdist to speed up tests
• eb45c0d Move to a declarative build script via setup.cfg, improve package metadata
• e646308 Fixed a typo in index.rst (#1269)
• 45ecd1a Link to Python 3 venv (#1086)
• d0a1d7e add changelog
• d74a677 clarify project
• Additional commits viewable in compare view

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Superseded by #59.