Include missing import

Author: Zomis

src/test/groovy/net/zomis/machlearn/images/MinesweeperScan.java

@@ -4,6 +4,7 @@
 import net.zomis.machlearn.neural.Backpropagation;
 import org.imgscalr.Scalr;
 
+import java.awt.*;
 import java.awt.image.BufferedImage;
 import java.util.*;
 import java.util.List;