Resubscription on the proposal_open_contract send does not work

[aminmarashi]

If the connection is closed before the proposal_open_contract is sent live api is unable to resubscribe.
The reason is streamId is required to save the contracts: https://github.com/binary-com/binary-live-api/blob/master/src/ApiState.js#L40
@borisyankov I think it's worth fixing if we can make things a little bit better in the code, otherwise this is a very rare condition and is not of high priority.

[aminmarashi]

This was not true. I made more experiments and the open contract proposal is made again on resubscribe function.