Fix style

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

@@ -39,7 +39,8 @@ public final class Example {
         SolutionDistance solution = trainer.run(data, expected);
         System.out.println(solution);
         long end_time = System.currentTimeMillis();
-        logger.log(Level.INFO, "Execution time : " + (end_time - start_time) / 1000 + " seconds");
+        logger.log(Level.INFO, "Execution time : "
+                 + (end_time - start_time) / 1000 + " seconds");
 
     }