Update colours in README table

Author: hugovk

README.md

@@ -56,16 +56,24 @@ cprint("Attention!", "red", attrs=["bold"], file=sys.stderr)
 
 ## Text properties
 
-| Text colors | Text highlights | Attributes  |
-| ----------- | --------------- | ----------- |
-| `grey`      | `on_grey`       | `bold`      |
-| `red`       | `on_red`        | `dark`      |
-| `green`     | `on_green`      | `underline` |
-| `yellow`    | `on_yellow`     | `blink`     |
-| `blue`      | `on_blue`       | `reverse`   |
-| `magenta`   | `on_magenta`    | `concealed` |
-| `cyan`      | `on_cyan`       |             |
-| `white`     | `on_white`      |             |
+| Text colors     | Text highlights    | Attributes  |
+| --------------- | ------------------ | ----------- |
+| `black`         | `on_black`         | `bold`      |
+| `red`           | `on_red`           | `dark`      |
+| `green`         | `on_green`         | `underline` |
+| `yellow`        | `on_yellow`        | `blink`     |
+| `blue`          | `on_blue`          | `reverse`   |
+| `magenta`       | `on_magenta`       | `concealed` |
+| `cyan`          | `on_cyan`          |             |
+| `white`         | `on_white`         |             |
+| `light_grey`    | `on_light_grey`    |             |
+| `dark_grey`     | `on_dark_grey`     |             |
+| `light_red`     | `on_light_red`     |             |
+| `light_green`   | `on_light_green`   |             |
+| `light_yellow`  | `on_light_yellow`  |             |
+| `light_blue`    | `on_light_blue`    |             |
+| `light_magenta` | `on_light_magenta` |             |
+| `light_cyan`    | `on_light_cyan`    |             |
 
 ## Terminal properties