Add volume arg to parser (#335)

This PR adds the mic volume to the arg parser and makes the value range from 1-100

README.md

@@ -80,7 +80,7 @@ usage: __main__.py [-h] [--name NAME] [--audio-input-device AUDIO_INPUT_DEVICE]
 | `--audio-input-device`     | Soundcard name for input device                               | Autodetected                      |
 | `--audio-input-block-size` | Audio input block size in samples                             | 1024                              |
 | `--audio-output-device`    | mpv name for output device                                    | Autodetected                      |
-| `--mic-volume`             | Control microphone volume                                     | 1.0                               |
+| `--mic-volume`             | Control microphone volume                                     | 100                               |
 | `--mic-auto-gain`          | Add WebRTC Gain to Mic                                        | 0                                 |
 | `--mic-noise-suppression`  | Add WebRTC Noise Suppression to Mic                           | 0                                 |
 | `--wake-word-dir`          | Directory with wake word models (.tflite) and configs (.json) | `wakewords/`                      |