Pegs

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**This version includes updates that are not backwards
compatible with older versions of PEGS**

* Substantial update to how input files and distances
are specified:
- New compulsory ``--peaks`` and ``--genes``
arguments must now be used to specify one or more
peakset and gene cluster files respectively.
- Distance intervals must be specified with new
``--distances`` option.
* New options added to customise the output heatmaps:
- ``--x-label`` and ``--y-label`` options allow custom
axis labels to be specified.
- Documentation on setting custom colours for heatmap
has been expanded (along with examples).
- Heatmap image format can be specified on the command
line either implicitly (via output file name extension)
or explicitly (using ``--format`` option). Supports
PNG, SVG, PDF etc.
* Added information on how to cite PEGS.

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* Patches to fix display of ``README`` landing page on
PyPI and include the changelog in the documentation.

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* Added support for Python 3.9.
* Dropped support for Python 2.7.
* Fixed bug with automatic installation of ``bedtools``
(was failing on some systems).
* Updated versions of dependencies: ``numpy`` (1.19.5),
``scipy`` (1.5.4), ``matplotlib`` (3.3.4) and
``seaborn`` (0.11.1).
* Update to installation information to indicate that
``PEGS`` can be installed directly from PyPI.

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* Updates to ``setup.py`` to enable distributions to be
built for upload to the Python Package Index (PyPI).

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* Fixes to the 'quick start' and 'licensing' sections of
the ``README``
* Add worked example using mouse glucocorticoidal data to
the ``README`` and the documentation.
* Update requirement for Pillow library to 8.1.1.
* Fix unit tests and add continuous integration testing
workflow in Github Actions.

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* Drop the requirement that cluster files must be named
``cluster_*.txt``; all files in the clusters directory
will now be included in the analysis. The file names
(without the file extension) will be used as x-axis
labels in the plots.

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