Update App.java

src/main/java/ch/hepia/my_app/App.java

@@ -4,10 +4,8 @@ package ch.hepia.my_app;
  * Hello world!
  *
  */
-public class App 
-{
-    public static void main( String[] args )
-    {
+public class App {
+    public static void main( String[] args ) {
         System.out.println( "Hello World!" );
     }
 }