Tweaked setup.py according to best practices.

[matejak]

• Removed absolute path setup kwarg.
• Made the README path absolute.
• Added comma to the last cathegory, so a new one can be added seamlessly.

[codecov-io]

Codecov Report

Merging #31 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #31   +/-   ##
=======================================
  Coverage   92.63%   92.63%           
=======================================
  Files          17       17           
  Lines         516      516           
=======================================
  Hits          478      478           
  Misses         38       38

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[scrutinizer-notifier]

The inspection completed: No new issues