Update README.md

Author: sciyen

plugins/README.md

@@ -10,7 +10,7 @@ This plugin is modified from `number.js` in [offical repo](https://github.com/jg
     - Click `Add` and `Custom...`
     - Enter 
         ```
-        plugins/zotero.js
+        https://sciyen.github.io/ResearchHelper/plugins/zotero.js
         ```
         and click `Add`. Finally, apply the change and refresh the site.
 
@@ -21,6 +21,5 @@ This plugin is modified from `number.js` in [offical repo](https://github.com/jg
     ![](https://i.imgur.com/Plw7U0k.png)
 
 # Current Issues
-- The Zotero API can not be imported by the plugin, which is an UMD module released by [Zotero Javascript API](https://github.com/tnajdek/zotero-api-client).
 - Our self-host digrams can not be authorized by google drive because we don't have a server to handle `/google` request. (This is mentioned in this [issue](https://github.com/jgraph/drawio/issues/642#issuecomment-551271207)).
-- The third-party plugins are not allowed to be added to official webapp because [this](https://github.com/jgraph/drawio/issues/958).
+- The third-party plugins are not allowed to be added to official webapp because [this](https://github.com/jgraph/drawio/issues/958).