[RLlib](deps): Bump gym[atari] from 0.18.3 to 0.20.0 in /python/requirements/rllib

[dependabot]

Bumps gym[atari] from 0.18.3 to 0.20.0.

Release notes

Sourced from gym[atari]'s releases.

0.20.0

Major Change:

• Replaced Atari-Py dependency with ALE-Py and bumped all versions. This is a massive upgrade with many changes, please see the full explainer (@​JesseFarebro)
• Note that ALE-Py does not include ROMs. You can install ROMs in two lines of bash with AutoROM though (pip3 install autorom and then autorom), see https://github.com/PettingZoo-Team/AutoROM. This is the recommended approach for CI, etc.

Breaking changes and new features:

• Add RecordVideo wrapper, deprecate monitor wrapper in favor of it and RecordEpisodeStatistics wrapper (@​vwxyzjn)
• Dependencies used outside of environments (e.g. for wrappers) are now in 'other' extra' (@​jkterry1)
• Moved algorithmic and unused toytext envs (guessing game, hotter colder, nchain, roulette, kellycoinflip) to third party repos (@​jkterry1, @​Rohan138)
• Fixed flatten utility and flatdim in MultiDiscrete sapce (@​tristandeleu)
• Add __setitem__ to dict space (@​jfpettit)
• Large fixes to .contains method for box space (@​FirefoxMetzger)
• Made blackjack environment properly comply with Barto and Sutton book standard, bumped to v1 (@​RedTachyon)
• Added NormalizeObservation and NormalizeReward wrappers (@​vwxyzjn)
• Add __getitem__ and __len__ to MultiDiscrete space (@​XuehaiPan)
• Changed .shape to be a property of box space to prevent unexpected behaviors (@​RedTachyon)

Bug fixes and upgrades:

• Video recorder gracefully handles closing (@​XuehaiPan)
• Remaining unnecessary dependencies in setup.py are resolved (@​jkterry1)
• Minor acrobot performance improvements (@​TuckerBMorgan)
• Pendulum properly renders when 0 force is sent (@​Olimoyo)
• Make observations dtypes be consistent with observation space dtypes for all classic control envs and bipedalwalker (@​RedTachyon)
• Removed unused and long depricated features in registration (@​Rohan138)
• Framestack wrapper now inherits from obswrapper (@​jfpettit)
• Seed method for spaces.Tuple and spaces.Dict now properly function, are fully stochastic, are fully featured and behave in the expected manner (@​XuehaiPan, @​RaghuSpaceRajan)
• Replace time() with perf_counter() for better measurements of short duration (@​zuoxingdong)

0.19.0

Gym 0.19.0 is a large maintenance release, and the first since @​jkterry1 became the maintainer. There should be no breaking changes in this release.

New features:

• Added custom datatype argument to multidiscrete space (@​m-orsini)
• API compliance test added based on SB3 and PettingZoo tests (@​amtamasi)
• RecordEpisodeStatics works with VectorEnv (@​vwxyzjn)

Bug fixes:

• Removed unused dependencies, removed unnescesary dependency version requirements that caused installation issues on newer machines, added full requirements.txt and moved general dependencies to extras. Notably, "toy_text" is not a used extra. atari-py is now pegged to a precise working version pending the switch to ale-py (@​jkterry1)
• Bug fixes to rewards in FrozenLake and FrozenLake8x8; versions bumped to v1 (@​ZhiqingXiao) -Removed remaining numpy depreciation warnings (@​super-pirata)
• Fixes to video recording (@​mahiuchun, @​zlig)
• EZ pickle argument fixes (@​zzyunzhi, @​Indoril007)
• Other very minor (nonbreaking) fixes

Other:

• Removed small bits of dead code (@​jkterry1)
• Numerous typo, CI and documentation fixes (mostly @​cclauss)
• New readme and updated third party env list (@​jkterry1)
• Code is now all flake8 compliant through black (@​cclauss)

Commits

• a7b6462 Updated registration.py (#2375)
• 6e42458 Update bug.md
• ee0a568 docstring fix for compute_reward (#2380)
• 7573c57 box.contains check dtype and promote non-ndarrays (#2374)
• 0b07221 change FrameStack wrapper to inherit from ObservationWrapper (#2378)
• cf0cf17 add setitem method to Dict action space (#2377)
• a004558 add episodic trigger (#2376)
• 1504041 Move Algorithmic Environments to Third Party Repo (#2344)
• 2bd436b black
• bbb3072 Update acrobot docstrings (#2362)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #51.