message: Apply suggestions from code review
  Replaced var with const
diff: @@ -369,7 +369,7 @@ You can set the price level, width, style and color of this line using the follo
  Example:
  ```javascript
  -var priceLine = series.createPriceLine({
  +const priceLine = series.createPriceLine({
  level: 80.0
  color: 'green',
  lineWidth: 2,
  @@ -391,7 +391,7 @@ Removes a price line that was created before.
  Example:
  ```javascript
  -var priceLine = series.createPriceLine({ level: 80.0 });
  +const priceLine = series.createPriceLine({ level: 80.0 });
  series.removePriceLine(priceLine);
  ```
  