Add omi-chart to extensions.md (#5912)

Author: 当耐特

docs/notes/extensions.md

@@ -65,3 +65,6 @@ In addition, many plugins can be found on the [npm registry](https://www.npmjs.c
 
 ### Ember.js
  - <a href="https://github.com/aomran/ember-cli-chart" target="_blank">ember-cli-chart</a>
+ 
+### Omi (v5+)
+ - <a href="https://github.com/Tencent/omi/tree/master/packages/omi-chart" target="_blank">omi-chart</a>