message: Replace "decodeFromInputVideoDevice" mentions with "decodeOnceFromVideoDevice"
  decodeFromInputVideoDevice is marked as deprecated in src/browser/BrowserCodeReader.ts, so replacing mentions of it in README with the replacement decodeOnceFromVideoDevice
diff: @@ -202,18 +202,18 @@ If there is just one input device you can use the first `deviceId` and the video
  const firstDeviceId = videoInputDevices[0].deviceId;
  codeReader
  - .decodeFromInputVideoDevice(firstDeviceId, 'video')
  + .decodeOnceFromVideoDevice(firstDeviceId, 'video')
  .then(result => console.log(result.text))
  .catch(err => console.error(err));
  ```
  -If there are more input devices then you will need to chose one for `codeReader.decodeFromInputVideoDevice` device id parameter.
  +If there are more input devices then you will need to chose one for `codeReader.decodeOnceFromVideoDevice` device id parameter.
  You can also provide `undefined` for the device id parameter in which case the library will automatically choose the camera, preferring the main (environment facing) camera if more are available:
  ```javascript
  codeReader
  - .decodeFromInputVideoDevice(undefined, 'video')
  + .decodeOnceFromVideoDevice(undefined, 'video')
  .then(result => console.log(result.text))
  .catch(err => console.error(err));
  ```
  