Update World of supply (WoS) to latest ray module

[ankithaldar]

Hi Ilya,

I have been experimenting with your nicely implemented module to understand 'Multi-agent deep reinforcement learning' and combinatorial optimization for 'multi-echelon supply chain'.

I hereby raise the issue since the latest RLLib module is not compatible with the code that you have created. It would be highly helpful for every one if you can provide the required modifications to make it compatible with the latest RLLib & ray package as multiple things have change in there.

Thanks
Ankit