Update sketch.js

colour_and_pattern/exercises/Blended_squares_add/sketch.js

@@ -14,7 +14,7 @@ function setup() {
   // By default, this is colorMode(HSB, 360, 100, 100, 1). 
   // You can also use HSL instead of HSB, but then the 3rd value will be lightness (whiteness) and won't refer to a pure colour.
 
-  colorMode(HSB);
+  colorMode(HSL);
 }
 
 function draw() {