fix comma

Im getting this error with gulp: highcharts-ng/higcharts-ng-d.ts(27,6) : error TS1005: ';' expected.

highcharts-ng/highcharts-ng.d.ts

@@ -24,7 +24,7 @@ interface HighChartsNGConfig {
         currentMin?: number;
         currentMax?: number;
         title?: { text?: string }
-    },
+    };
     //Whether to use HighStocks instead of HighCharts (optional). Defaults to false.
     useHighStocks?: boolean;
     //size (optional) if left out the chart will default to size of the div or something sensible.
@@ -40,4 +40,4 @@ interface HighChartsNGConfig {
 interface HighChartsNGChart extends HighChartsNGConfig {
     //This is a simple way to access all the Highcharts API that is not currently managed by this directive.
     getHighcharts(): HighchartsChartObject;
-}
+}