Update python-chess to 1.0.1

[pyup-bot]

This PR updates python-chess from 0.31.4 to 1.0.1.

Changelog

1.0.1

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Bugfixes:

* `chess.svg`: Restore SVG Tiny compatibility by splitting colors like
`rrggbbaa` into a solid color and opacity.

1.0.0

-------------

Changes:

* Now requires Python 3.7+.
* `chess.engine` will now cut off illegal principal variations at the first
illegal move instead of discarding them entirely.
* `chess.engine.EngineProtocol` renamed to `chess.engine.Protocol`.
* `chess.engine.Option` is no longer a named tuple.
* Renamed `chess.gaviota` internals.
* Relaxed type annotations of `chess.pgn.GameNode.variation()` and related
methods.
* Changed default colors of `chess.svg.Arrow` and
`chess.pgn.GameNode.arrows()`. These can be overriden with the new
`chess.svg.board(..., colors)` feature.
* Documentation improvements. Will now show type aliases like `chess.Square`
instead of `int`.

Bugfixes:

* Fix insufficient material with same-color bishops on both sides.
* Clarify that `chess.Board.can_claim_draw()` and related methods refer to
claims by the player to move. Three-fold repetition could already be claimed
before making the final repeating move. `chess.Board.can_claim_fifty_moves()`
now also allows a claim before the final repeating move. The previous
behavior is `chess.Board.is_fifty_moves()`.
* Fix parsing of green arrows/circles in `chess.pgn.GameNode.arrows()`.
* Fix overloaded type signature of `chess.engine.Protocol.engine()`.

New features:

* Added `chess.parse_square()`, to be used instead of
`chess.SQUARE_NAMES.index()`.
* Added `chess.Board.apply_mirror()`.
* Added `chess.svg.board(..., colors)`, to allow overriding the default theme.

Links

• PyPI: https://pypi.org/project/python-chess
• Changelog: https://pyup.io/changelogs/python-chess/
• Repo: https://github.com/niklasf/python-chess

Resolves #2334