Procrunner

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* `Deprecated array access on the return object (60). <https://github.com/DiamondLightSource/python-procrunner/pull/60>`_
The return object will become a subprocess.CompletedProcess in a future
release, which no longer allows array-based access. For a translation table
of array elements to attributes please see the pull request linked above.
* Add a `new parameter 'raise_timeout_exception' (61). <https://github.com/DiamondLightSource/python-procrunner/pull/61>`_
When set to 'True' a subprocess.TimeoutExpired exception is raised when the
process runtime exceeds the timeout threshold. This defaults to 'False' and
will be set to 'True' in a future release.

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* Python 3.5+ only, support for Python 2.7 has been dropped
* Deprecated function alias run_process() has been removed
* Fixed a stability issue on Windows

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* Add Python 3.8 support, drop Python 3.4 support

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* Stop environment override variables leaking into the process environment

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* Minor fixes on the return object (implement equality,
mark as unhashable)

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* Support file system path objects (PEP-519) in arguments
* Change the return object to make it similar to
subprocess.CompletedProcess, introduced with Python 3.5+