fix spaces -> tabs

src/Chart.Doughnut.js

@@ -93,8 +93,8 @@
 		addData : function(segment, atIndex, silent){
 			var index = atIndex !== undefined ? atIndex : this.segments.length;
 			if ( typeof(segment.color) === "undefined" ) {
-                segment.color = Chart.defaults.global.segmentColorDefault[index];
-                segment.highlight = Chart.defaults.global.segmentHighlightColorDefaults[index];				
+				segment.color = Chart.defaults.global.segmentColorDefault[index];
+				segment.highlight = Chart.defaults.global.segmentHighlightColorDefaults[index];				
 			}
 			this.segments.splice(index, 0, new this.SegmentArc({
 				value : segment.value,