We need also "imageio" to render MuJoCo.

[foxik]

Yep, you are right, I missed that in the gym[mujoco] section.

[foxik]

I solved the missing dependency in a custom commit, because:

• there were two more places where the dependency was missing
• I want explicit versions (to explicitly indicate what versions are in ReCodEx)

Of course, the community-work points are on the rise ;-)