0.22.0
Test refactoring (#2427)
Adding return_info argument to reset to allow for optional info dict as a second return value (#2546)
Added singledispatch utility to vector.utils & changed order of space argument. (#2536)
Batch action_space in VectorEnv (#2280)
Remove unittest envs (#2553)
Seeding update (#2422)
Add options to the signature of `env.reset` (#2515)