Typo in train.py

[opt12]

After walking through the code, I think, that there is a type here: https://github.com/openai/maddpg/blob/3ceefa0ada3ff31d633dd0bde8ff95213ce99be3/experiments/train.py#L141

Should be: agent_info[-1][i].append(info['n']) instead of `info_n['n']'.