New Env

1. finish porting classic_control (#25, #34)

Bug Fix

1. Atari speed and correctness (#21, #35)
2. avoid overwriting config when registering multiple envs (#29)
3. remove -1 in python spec, otherwise it cannot use action_spaec.sample() (#34)
4. change abc_meta in py_envpool.h to support multiple pybind11 registrations in one file (#34)

Documentation

1. how to integrate new env into envpool (#31, #32)

Enhancement

1. add ci pipeline for generating wheels (#36)
2. update issue templates
3. add a warning when calling envpool.seed function (#22)
4. raise ValueError when batch_size > num_envs (#22)
5. move reward to common_state_spec (#22)
6. add reward_threshold in config and will auto pop up in env.spec.reward_threshold (#24)
7. split registration to per-env (#26)

Bug Fix

1. fix atari env cv2::resize bug: previous code doesn't use INTER_AREA correctly (#13)
2. fix black screen in atari env (#15)

Enhancement

1. add dockerfile for develop env and release env: make docker-dev and make docker-release respectively (#11)
2. upgrade ALE to 0.7.3 (#15)
3. fix auditwheel purelib warning (#12)
4. add repeat_action_probability (#15)

First open-source EnvPool version. Only include Atari environments but reserve multi-agent APIs for further integration.