Change update for celltype bomb

src/main/java/Minesweeper/Cell.java

@@ -43,6 +43,8 @@ public class Cell extends JButton {
 	public void update() {
 		if (type == CellType.Number) {
 			setText(String.valueOf(value));
+		} else {
+			setBackground(Color.RED);
 		}
 	}
 

src/main/java/Minesweeper/Playfield.java

@@ -38,6 +38,7 @@ public class Playfield {
 				for (int k = 0; k < bPlacement.length; k++) {
 					if (bPlacement[k] == i * Size + j) {
 						cells[i][j].type = CellType.Bomb;
+						cells[i][j].update();
 						break;
 					}
 				}