~~~~~~~~~~~
Released June 2019
* Added :ref:`a set of constants to use when referring to specifications that
define color names <spec-constants>`.
* When asked to provide a color name, using the CSS3/SVG set of names, for the
hexadecimal value ``808080``, the integer triplet ``rgb(128, 128, 128)``, or
the percentage triplet ``rgb(50%, 50%, 50%)``, ``webcolors`` now always returns
``u'gray'``, never ``u'grey'``. Previously, the behavior could be
inconsistent as it depended on the Python version in use; ``u'gray'`` was
picked because it was the spelling variant used in HTML 4, CSS1, and CSS2.