Pytest-runner

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(Pulled from PyPI due to 43)

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

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

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* 40: Declare dependency on Setuptools in package metadata.

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* Drop support for Setuptools before Setuptools 27.3.0.

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* 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.

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* Dropped support for Python 2.6 and 3.1.