CalcSkin

src/main/java/rocks/zipcode/calcskin/CalcSkin.java

@@ -28,6 +28,7 @@ public class CalcSkin extends Application {
     };
 
     private final Map<String, Button> accelerators = new HashMap<>();
+
     private DoubleProperty previousValue = new SimpleDoubleProperty();
     private DoubleProperty currentValue = new SimpleDoubleProperty();
     private CalcEngine calcEngine = new CalcEngine();