Andrew Mikofalvy

Add additional transcription language support for the async API client

1

As a rev.ai golang sdk user, I would like to be able to submit transcription for languages other than English. Add support for the new `language` parameter as documented on...

Add new job option `custom_vocabulary_id` to the async api job options as defined by the REST API documentation: https://www.rev.ai/docs#operation/SubmitTranscriptionJob