Amazon-transcribe

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* The required version of awscrt has been upgraded to 0.11.15

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* The required version of awscrt has been upgraded to 0.11.11 (20, 22)

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* The `create_client` helper function has been removed in favor of
creating `TranscribeStreamingClient` directly.

* Added support for the `vocab_filter_name` argument in
`start_stream_transcription`. (11)

* Added support for multi-channel audio transcription and speaker labels (13)

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* Initial release of Amazon Transcribe Streaming SDK for Python.