atari-py is no longer supported

[rcshubhadeep]

If you go to the github page of Atari-py then you will see the following

Status: Deprecated (don't expect bug fixes or other updates)

Notice: atari-py is fully deprecated and no future updates, bug fixes or releases will be made. Please use the official Arcade Learning Environment Python package (ale-py) instead; it is fully backwards compatible with all atari-py code.

I believe that this library should upgrade.