python-chess v1.1.0

New features:

* Added `chess.svg.board(..., orientation)`. This is a more idiomatic way to
  set the board orientation than `flipped`.
* Added `chess.svg.Arrow.pgn()` and `chess.svg.Arrow.from_pgn()`.

Changes:

* Further relaxed `chess.Board.parse_san()`. Now accepts fully specified moves
  like `e2e4`, even if that is not a pawn move, castling notation with zeros,
  null moves in UCI notation, and null moves in XBoard notation.