made font size a bit larger

javascript/src/Plugins/qfq.fabric.js

@@ -594,7 +594,7 @@ $(function (n) {
             top: 20,
             fontFamily: 'Arial',
             fill: color,
-            fontSize: 16
+            fontSize: 18
         });
         this.canvas.add(text);
         this.canvas.renderAll();