Update Icons8 (#2811)

README.md

@@ -189,7 +189,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Harvard Art Museums](https://github.com/harvardartmuseums/api-docs) | Art | `apiKey` | No | Unknown |
 | [Icon Horse](https://icon.horse) | Favicons for any website, with fallbacks | No | Yes | Yes |
 | [Iconfinder](https://developer.iconfinder.com) | Icons | `apiKey` | Yes | Unknown |
-| [Icons8](http://docs.icons8.apiary.io/#reference/0/meta) | Icons | `OAuth` | Yes | Unknown |
+| [Icons8](https://img.icons8.com/) | Icons (find "search icon" hyperlink in page) | No | Yes | Unknown |
 | [Metropolitan Museum of Art](https://metmuseum.github.io/) | Met Museum of Art | No | Yes | No |
 | [Noun Project](http://api.thenounproject.com/index.html) | Icons | `OAuth` | No | Unknown |
 | [PHP-Noise](https://php-noise.com/) | Noise Background Image Generator | No | Yes | Yes |