Debounce at trailing edge instead of leading

This fixes an issue where points on a card would not be detected when the card was moved between columns.

src/scrummer.js

@@ -180,7 +180,7 @@ var calculateStoryPointsForBoard = function () {
 }
 
 var calculateStoryPointsForBoardDebounced = function () {
-  debounce(calculateStoryPointsForBoard, 200, true)();
+  debounce(calculateStoryPointsForBoard, 100)();
 }
 
 /**