Fix checkstyle issue

src/main/java/be/cylab/java/wowa/training/Example.java

@@ -80,7 +80,8 @@ public final class Example {
 
         for (int i = 0; i < solutions.size(); i++) {
             System.out.println(solutions.get(i));
-            System.out.println("AUC Value for fold" + i + solutions.get(i).computeAUC(
+            System.out.println("AUC Value for fold"
+                    + i + solutions.get(i).computeAUC(
                     data_file,
                     expected_file));
         }