Proc

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- Demote race condition log messages from WARNING to DEBUG level.

Reasoning: Race condition log messages are so frequent that they become
noise, drowning out other more important log messages, so I decided to make
them less noisy 🙂.

- Fixed a confusing typo in the API docs, left over from a sentence that was
(half) reformulated.

- Noted a future improvement in the documentation: Generalized
``notify-send-headless`` functionality.

.. _Release 0.8.5: https://github.com/xolox/python-proc/compare/0.8.4...0.8.5

-----------------------------

- Improved ``notify-send-headless`` documentation.
- Improved test coverage by mocking external dependencies.

.. _Release 0.8.4: https://github.com/xolox/python-proc/compare/0.8.3...0.8.4

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- Increase ``cron-graceful[-additions]`` test coverage.
- Avoid duplicate builds on Travis CI.
- Test suite bug fix.

.. _Release 0.8.3: https://github.com/xolox/python-proc/compare/0.8.2...0.8.3

-----------------------------

Increase test coverage (somewhat of a cop-out 🙂).

.. _Release 0.8.2: https://github.com/xolox/python-proc/compare/0.8.1...0.8.2

-----------------------------

Now including an upstream bug fix to make the previous release work :-(.

.. _Release 0.8.1: https://github.com/xolox/python-proc/compare/0.8...0.8.1

---------------------------

- Try to make ``notify-send-headless`` foolproof.
- Document supported Python implementations in ``setup.py``.
- Enabled Python 3.5 tests on Travis CI, documented Python 3.5 support.

.. _Release 0.8: https://github.com/xolox/python-proc/compare/0.7...0.8