Update wheel to 0.31.0

[pyup-bot]

This PR updates wheel from 0.29.0 to 0.31.0.

Changelog

0.31.0

======
- Fixed displaying of errors on Python 3
- Fixed single digit versions in wheel files not being properly recognized
- Fixed wrong character encodings being used (instead of UTF-8) to read and
write ``RECORD`` (this sometimes crashed bdist_wheel too)
- Enabled Zip64 support in wheels by default
- Metadata-Version is now 2.1
- Dropped DESCRIPTION.rst and metadata.json from the list of generated files
- Dropped support for the non-standard, undocumented ``provides-extra`` and
``requires-dist`` keywords in setup.cfg metadata
- Deprecated all wheel signing and signature verification commands
- Removed the (already defunct) ``tool`` extras from setup.py

0.30.0

======
- Added py-limited-api {cp32|cp33|cp34|...} flag to produce cpNN.abi3.{arch}
tags on CPython 3.
- Documented the ``license_file`` metadata key
- Improved Python, abi tagging for `wheel convert`. Thanks Ales Erjavec.
- Fixed `>` being prepended to lines starting with "From" in the long description
- Added support for specifying a build number (as per PEP 427).
Thanks Ian Cordasco.
- Made the order of files in generated ZIP files deterministic.
Thanks Matthias Bach.
- Made the order of requirements in metadata deterministic. Thanks Chris Lamb.
- Fixed `wheel install` clobbering existing files
- Improved the error message when trying to verify an unsigned wheel file
- Removed support for Python 2.6, 3.2 and 3.3.

Links

• PyPI: https://pypi.python.org/pypi/wheel
• Changelog: https://pyup.io/changelogs/wheel/
• Repo: https://github.com/pypa/wheel

[pyup-bot]

Closing this in favor of #32