fixed spacing

java/7-mvc/hellomvc4/Main.java

@@ -12,7 +12,7 @@ import java.awt.Dimension;
 import java.awt.GridLayout;
 import java.awt.event.*;	
 
-public class Main{
+public class Main {
 
 	public static void main(String[] args){	
 		JFrame frame = new JFrame("HelloMVC4");