Merge pull request #3888 from gxoptg/patch-1

Mark "highlight" and "label" properties of CircularChartData as optional

chartjs/chart.d.ts

@@ -28,8 +28,8 @@ interface LinearChartData {
 interface CircularChartData {
     value: number;
     color: string;
-    highlight: string;
-    label: string;
+    highlight?: string;
+    label?: string;
 }
 
 interface ChartSettings {