removing SDK_VERSION from generate_token request, it is not required.
removing SDK_VERSION from generate_token request, it is not required.

hbaqai/opentok-node,jeffswartz/opentok-node,aoberoi/opentok-node,opentok/opentok-node,davemun/opentok-node,bsstoner/opentok,AntonioMA/opentok-node