Openskill

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Features
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- ``tau`` (defaults to 0): Additive dynamics factor, which keeps a player's rating from getting stuck at a level. Normally, a player's sigma will only decrease as we gain more information about their performance. This option will put some pressure on this back up. This default will change to be sigma/100 with v3, to be more congruent with TrueSkill, but higher may make your rating system more exciting. (`50 <https://github.com/vivekjoshy/openskill.py/issues/50>`_)

- ``prevent_sigma_increase`` (defaults to ``False``): for a tau > 0, it is possible that a player could play someone with a low enough rating that even if they win, their ordinal rating will still go down slightly. If your players have no agency in matchmaking, it is not desirable to have a situation where a player goes down on the leaderboard even though they win. (`50 <https://github.com/vivekjoshy/openskill.py/issues/50>`_)

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Features
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- Faster runtime of ``predict_win`` and ``predict_draw``. (`48 <https://github.com/vivekjoshy/openskill.py/issues/48>`_)

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Breaking Changes
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- The ``rate`` function now returns ``Rating`` objects. (`46 <https://github.com/vivekjoshy/openskill.py/issues/46>`_)
- Changes ``ordinal`` to accept both ``Rating`` objects and lists or tuples of 2 floats. (`46 <https://github.com/vivekjoshy/openskill.py/issues/46>`_)


Features
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- Add a function to predict draws. (`45 <https://github.com/vivekjoshy/openskill.py/issues/45>`_)
- ``create_rating`` now checks if the argument is the correct type. (`46 <https://github.com/vivekjoshy/openskill.py/issues/46>`_)

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Features
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- Updates scipy to 1.8.0 (`37 <https://github.com/vivekjoshy/openskill.py/issues/37>`_)

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Features
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- Update development status to "Stable" (`34 <https://github.com/vivekjoshy/openskill.py/issues/34>`_)

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Features
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- Capability to predict winners of match given a set of teams. (`27 <https://github.com/vivekjoshy/openskill.py/issues/27>`_)