Make hardcoded int to truncate printed transcription length configurable

[Rasmusmario123]

In the client.py script, the last part of the process_segments method looks like this

        # Truncate to last 3 entries for brevity.
        text = text[-3:]
        utils.clear_screen()
        utils.print_transcript(text)

I think it would be better if the user could pass a value through the TranscriptionClient class to set the number of entries that should be printed to the terminal

[makaveli10]

@Rasmusmario123 Sounds like a good idea. Feel free to open PR.