enable multiple calls to subscribe for same event type #114
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Description
A bug in the DXLinkStreamer was making it impossible to subscribe more than once with the same event type, and crashing the streamer.
Related issue(s)
Fixes #113
Pre-merge checklist
Please note that, in order to pass the tests, you'll need to set up your Tastytrade credentials as repository secrets on your local fork. Read more at CONTRIBUTING.md.