fixed #1020

Author: jaywcjlove

docs/feds.md

@@ -82,7 +82,6 @@ CSS 工具
 [ColorZilla](http://www.colorzilla.com/gradient-editor/)<!--rehype:target=_blank&style=background: rgb(106 106 106/var(\-\-bg\-opacity));-->
 [CSS Protips](https://github.com/AllThingsSmitty/css-protips)<!--rehype:target=_blank&style=background: rgb(106 106 106/var(\-\-bg\-opacity));-->
 [CSS3 Maker](http://www.css3maker.com/)<!--rehype:target=_blank&style=background: rgb(106 106 106/var(\-\-bg\-opacity));-->
-[cssnano](http://cssnano.co/)<!--rehype:target=_blank&style=background: rgb(106 106 106/var(\-\-bg\-opacity));-->
 [CSSPIN](https://webkul.github.io/csspin/)<!--rehype:target=_blank&style=background: rgb(106 106 106/var(\-\-bg\-opacity));-->
 [CSSreference](https://cssreference.io/)<!--rehype:target=_blank&style=background: rgb(106 106 106/var(\-\-bg\-opacity));-->
 [CSSTree](https://github.com/csstree/csstree)<!--rehype:target=_blank&style=background: rgb(106 106 106/var(\-\-bg\-opacity));-->