message: 71: Updated documentation
diff: @@ -21,6 +21,20 @@ If you want the chart size to be adjusted when the web page is resized, use the
  chart.resize(250, 150);
  ```
  +If specify width or height equal to zero, the size will be canculated as parent's content rect.
  +
  +### Use Observer
  +
  +If specify `useObserver`, the chart size will be dynamically adjusted to container size on any change.
  +If specified, `width` and `height` parameters will be ignored.
  +This option requires `ResizeObserver` feature to be supported by the browser. If old browsers support is required, the calling code is responsible for polyfill integration.
  +
  +```js
  +const chart = LightweightCharts.createChart(document.body, {
  + useObserver: true,
  +});
  +```
  +
  ### Localization
  Using the `localization` option you can set the displayed language, date and time formats.
  