Update pytest-runner to 4.5

[pyup-bot]

This PR updates pytest-runner from 2.12.1 to 4.5.

Changelog

4.5

===

* Packaging (skeleton) refresh, including adoption of
`black <https://pypi.org/project/black>`_ for style.

4.4

===

* 43: Detect condition where declarative config will cause
errors and emit a UserWarning with guidance on necessary
actions.

4.3.1

=====

* 43: Re-release of 4.2 to supersede the 4.3 release which
proved to be backward-incompatible in that it requires
setuptools 30.4 or possibly later (to install). In the future, a
backward-incompatible release will re-release these changes.
For projects including pytest-runner, particularly as
``setup_requires``, if support for older setuptools is required,
please pin to ``pytest-runner < 5``.

4.3

===

(Pulled from PyPI due to 43)

* 42: Update project metadata, including pyproject.toml declaration.

4.2

===

* 40: Remove declared dependency and instead assert it at
run time.

4.1

===

* 40: Declare dependency on Setuptools in package metadata.

4.0

===

* Drop support for Setuptools before Setuptools 27.3.0.

3.0.1

=====

* 38: Fixed AttributeError when running with ``--dry-run``.
``PyTest.run()`` no longer stores nor returns the result code.
Based on the commit message for `840ff4c <
https://github.com/pytest-dev/pytest-runner/commit/840ff4c2bf6c752d9770f0dd8d64a841060cf9bc>`_,
nothing has ever relied on that value.

3.0

===

* Dropped support for Python 2.6 and 3.1.

2.12.2

======

* 33: Packaging refresh.

Links

• PyPI: https://pypi.org/project/pytest-runner
• Changelog: https://pyup.io/changelogs/pytest-runner/
• Repo: https://github.com/pytest-dev/pytest-runner/

[coveralls]

Coverage remained the same at 91.297% when pulling a54c3e3 on pyup-update-pytest-runner-2.12.1-to-4.5 into a36cff7 on master.

[coveralls]

Coverage remained the same at 91.297% when pulling a54c3e3 on pyup-update-pytest-runner-2.12.1-to-4.5 into a36cff7 on master.

[pyup-bot]

Closing this in favor of #143