chore: update doc

fixed docsifyjs#187

Author: QingWei-Li

docs/plugins.md

@@ -91,7 +91,7 @@ If the script on the page is an external one (imports a js file via `src` attrib
 
 ## Zoom image
 
-Medium's Image Zoom. Based on [zoom-image](https://github.com/egoist/zoom-image).
+Medium's image zoom. Based on [medium-zoom](https://github.com/francoischalifour/medium-zoom).
 
 ```html
 <script src="//unpkg.com/docsify/lib/plugins/zoom-image.min.js"></script>