Arcade Learning Environment 0.7.5

Added

• Added validation for Gym's frameskip values.
• Made ROM loading more robust with module-level __getattr__ and __dir__.
• Added py.typed to the Python module's root directory to support type checkers.
• Bumped SDL to v2.0.16.

Fixed

• Fixed Gym render mode metadata. (@vwxyzjn)
• Fixed Gym warnings about seeding.hash_seed and random.randint.
• Fixed build infrastructure issues from the migration to setuptools>=0.61.

Removed

• Removed Gym's .render(mode='human'). Gym now uses the render_mode keyword argument in the environment constructor.