Not working createThreadAndRun / createThreadAndRunStream

[crash481]

Tried to run Assistants api method that created thread and run in same function, but gets error
THREAD ERROR: responseUnsuccessful(description: "status code 400 You must provide the \'OpenAI-Beta\' header to access the Assistants API. Please try again by setting the header \'OpenAI-Beta: assistants=v2\'.", statusCode: 400)

The problem that in method service.createRunStream and service.createRun you add betaHeaderField: Self.assistantsBetaV2
But in method service.createThreadAndRun and service.createThreadAndRunStream not

But this methods is very convenience. It is good to have option to start new thread with start user message and run it oneline

[jamesrochabrun]

Thanks for your report, fixed here #69