Update c3.min.js

c3.js

@@ -5297,7 +5297,7 @@
     };
     c3_chart_internal_fn.unselectPoint = function (target, d, i) {
         var $$ = this;
-        $$.config.data_onunselected(d, target.node());
+        $$.config.data_onunselected.call($$.api, d, target.node());
         // remove selected-circle from low layer g
         $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i)
             .transition().duration(100).attr('r', 0)