Error with MultiDiscrete spaces

Hi everybody, I run into a weird behaviour in the environment.py file in line: 56.

# total action space
if len(total_action_space) > 1:
    # all action spaces are discrete, so simplify to MultiDiscrete action space
    if all([isinstance(act_space, spaces.Discrete) for act_space in total_action_space]):
         act_space = spaces.MultiDiscrete([[0,act_space.n-1] for act_space in total_action_space])

creates an error in the mulidiscrete space. It says that nvec expects an 1 dimensional vector, but it recieves a 2 dimensional vector.

[HassamSheikh]

Use gym version 0.9.4.

[ryan-lowe]

Latest push should be compatible with newest version of gym.