What's Changed
* [Backgammon] Refactor to use `replace` by nissymori in https://github.com/sotetsuk/pgx/pull/420
* [ConnectFour, Othello] Add boards by sotetsuk in https://github.com/sotetsuk/pgx/pull/429
* [Visualizer] Split long function by OkanoShinri in https://github.com/sotetsuk/pgx/pull/430
* [Visualizer] Visualize `State` in Notebook by OkanoShinri in https://github.com/sotetsuk/pgx/pull/431
* [BridgeBidding] Add _reward by harukaki in https://github.com/sotetsuk/pgx/pull/362
* [BridgeBidding] rename files by sotetsuk in https://github.com/sotetsuk/pgx/pull/434
* [BridgeBidding] remove `np.ones(1), np.zeros(1)` by harukaki in https://github.com/sotetsuk/pgx/pull/436
* [Backgammon] Change turn representation from[-1, 1] to [0, 1] by nissymori in https://github.com/sotetsuk/pgx/pull/433
* [Visualizer] Fix batch visualization by OkanoShinri in https://github.com/sotetsuk/pgx/pull/437
* [Visualizer, Backgammon] Use `abs_board` by OkanoShinri in https://github.com/sotetsuk/pgx/pull/432
* [Visualizer, TicTacToe] Fix player symbols by OkanoShinri in https://github.com/sotetsuk/pgx/pull/440
* [Visualizer] Add Othello-Visualiser by OkanoShinri in https://github.com/sotetsuk/pgx/pull/441
* [Visualizer] Add ConnectFour-Visualizer by OkanoShinri in https://github.com/sotetsuk/pgx/pull/442
* [Visualizer] Minor modifications by OkanoShinri in https://github.com/sotetsuk/pgx/pull/445
* [Docs] Make `go.gif` smaller and explicit by sotetsuk in https://github.com/sotetsuk/pgx/pull/446
* [Docs] Add logo by sotetsuk in https://github.com/sotetsuk/pgx/pull/447
* [Visualizer, Connect Four] Add horizontal line by OkanoShinri in https://github.com/sotetsuk/pgx/pull/452
* [Visualizer, Bridge] make visualizer flexible by OkanoShinri in https://github.com/sotetsuk/pgx/pull/451
* [Go] add peculiar case by youyou-ku in https://github.com/sotetsuk/pgx/pull/453
* [Go] Add _count_point by youyou-ku in https://github.com/sotetsuk/pgx/pull/455
* [Hex] Add State by OkanoShinri in https://github.com/sotetsuk/pgx/pull/456
* [BridgeBidding] Reimplementation in jax by harukaki in https://github.com/sotetsuk/pgx/pull/449
* [Visualizer, BridgeBidding] Fix test by sotetsuk in https://github.com/sotetsuk/pgx/pull/459
* [Docs] Update README by sotetsuk in https://github.com/sotetsuk/pgx/pull/460
* [Docs] Add LICENSE by sotetsuk in https://github.com/sotetsuk/pgx/pull/462
* [BridgeBidding] `state`: Inherits `core.state`, `init` `step`: match return values to other games by harukaki in https://github.com/sotetsuk/pgx/pull/458
* [BridgeBidding] Fix bridge visualizer test by sotetsuk in https://github.com/sotetsuk/pgx/pull/464
* [Go] Unite two `ren_id_board` into one by sotetsuk in https://github.com/sotetsuk/pgx/pull/369
**Full Changelog**: https://github.com/sotetsuk/pgx/compare/v0.0.19...v0.0.20