ascii-art: correcting subject

subjects/ascii-art/color/README.md

@@ -4,15 +4,17 @@
 
 You must follow the same [instructions](https://public.01-edu.org/subjects/ascii-art/) as in the first subject but with colors.
 
-- The output should manipulate colors using the **flag** `--color=<color>`, in which `--color` is the flag and `<color>` is the color name of choice (ex: orange, green, blue).
-- The colors must respect the [RGB](https://en.wikipedia.org/wiki/RGB_color_model) concept.
+- The output should manipulate colors using the **flag** `--color=<color>`, in which `--color` is the flag and `<color>` is the color
+  desired by the user.
+- The colors can be done using different notations (color code systems, like `RGB`, `hsl`, `ANSI`, ...), its up to you to
+  choose which one you want to use.
 - You should be able to specify a single or a set of letters you want to be colored (use your imagination for this one).
 - If the letter isn't specified, the whole `string` should be colored.
 
 This project will help you learn about :
 
 - The Go file system(**fs**) API.
-- RGB color model.
+- Color converters.
 - Ways to receive data.
 - Ways to output data.
 - Manipulation of strings.