Fixed a bug when running multiple times

src/main/java/mattrixwv/ProjectEuler/Problems/Problem31.java

@@ -27,9 +27,10 @@ public class Problem31 extends Problem{
 	private int permutations;
 	public Problem31(){
 		super("How many different ways can 2 pounds be made using any number of coins?");
-		permutations = 0;
 	}
 	public void solve(){
+		permutations = 0;
+
 		//Start the timer
 		timer.start();