mise à jour config junit

src/main/java/ByteGrayColor.java

@@ -10,6 +10,8 @@ public class ByteGrayColor implements GrayColor {
     private static final int MAXIMUM_GRAY_LEVEL = 255;
     private static final int OPACITY = 1;
 
+    // TODO : add static ByteGrayColors WHITE and BLACK
+
     private final int grayLevel;