add heuristic(no args) to GoalComposite

GoalNear and GoalRunAway are still missing it

src/api/java/baritone/api/pathing/goals/GoalComposite.java

@@ -57,6 +57,16 @@ public class GoalComposite implements Goal {
         return min;
     }
 
+    @Override
+    public double heuristic() {
+        double min = Double.MAX_VALUE;
+        for (Goal g: goals) {
+            //just take the highest value that is guaranteed to be inside the goal
+            min = Math.min(min, g.heuristic());
+        }
+        return min;
+    }
+
     @Override
     public String toString() {
         return "GoalComposite" + Arrays.toString(goals);