message: Made series markers id optional
diff: @@ -7,7 +7,7 @@ export interface SeriesMarker<TimeType> {
  position: SeriesMarkerPosition;
  shape: SeriesMarkerShape;
  color: string;
  - id: string;
  + id?: string;
  }
  export interface InternalSeriesMarker<TimeType> extends SeriesMarker<TimeType> {
  