Update readme.md (#2442)

Author: Zo-Bro-23

readme.md

@@ -259,7 +259,7 @@ You can customize the appearance of your `Stats Card` or `Repo Card` however you
 -   `bg_color` - Card's background color _(hex color)_ **or** a gradient in the form of _angle,start,end_. Default: `fffefe`
 -   `hide_border` - Hides the card's border _(boolean)_. Default: `false`
 -   `theme` - name of the theme, choose from [all available themes](./themes/README.md). Default: `default` theme. 
--   `cache_seconds` - set the cache header manually _(min: 7200, max: 86400)_. Default: `14400 seconds (4 hours)`.
+-   `cache_seconds` - set the cache header manually _(min: 14400, max: 86400)_. Default: `14400 seconds (4 hours)`.
 -   `locale` - set the language in the card _(e.g. cn, de, es, etc.)_. Default: `en`.
 -   `border_radius` - Corner rounding on the card. Default: `4.5`.