Update setuptools to 45.0.0

[pyup-bot]

This PR updates setuptools from 42.0.2 to 45.0.0.

Changelog

### 45.0.0 ``` ------- * 1458: Drop support for Python 2. Setuptools now requires Python 3.5 or later. Install setuptools using pip >=9 or pin to Setuptools <45 to maintain 2.7 support. * 1959: Fix for Python 4: replace unsafe six.PY3 with six.PY2 ``` ### 44.0.0 ``` ------- * 1908: Drop support for Python 3.4. ``` ### 43.0.0 ``` ------- * 1634: Include ``pyproject.toml`` in source distribution by default. Projects relying on the previous behavior where ``pyproject.toml`` was excluded by default should stop relying on that behavior or add ``exclude pyproject.toml`` to their MANIFEST.in file. * 1927: Setuptools once again declares 'setuptools' in the ``build-system.requires`` and adds PEP 517 build support by declaring itself as the ``build-backend``. It additionally specifies ``build-system.backend-path`` to rely on itself for those builders that support it. ```

Links

- PyPI: https://pypi.org/project/setuptools - Changelog: https://pyup.io/changelogs/setuptools/ - Repo: https://github.com/pypa/setuptools

[codecov[bot]]

Codecov Report

Merging #168 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #168   +/-   ##
=======================================
  Coverage   65.56%   65.56%           
=======================================
  Files          16       16           
  Lines        1484     1484           
=======================================
  Hits          973      973           
  Misses        511      511

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[pyup-bot]

Closing this in favor of #171