Docs: add missing top languages card layouts. (anuraghazra#2717)

readme.md

@@ -303,7 +303,7 @@ You can provide multiple comma-separated values in the bg_color option to render
 
 -   `hide` - Hide the languages specified from the card _(Comma-separated values)_. Default: `[] (blank array)`.
 -   `hide_title` - _(boolean)_. Default: `false`.
--   `layout` - Switch between two available layouts `default` & `compact`. Default: `default`.
+-   `layout` - Switch between four available layouts `normal` & `compact` & `donut` & `pie`. Default: `normal`.
 -   `card_width` - Set the card's width manually _(number)_. Default `300`.
 -   `langs_count` - Show more languages on the card, between 1-10 _(number)_. Default `5`.
 -   `exclude_repo` - Exclude specified repositories _(Comma-separated values)_. Default: `[] (blank array)`.