fix(jQuery): -を追加

Author: azu

ja/jQuery/README.md

@@ -104,5 +104,5 @@ calculator.fn = calculator.prototype;
 
 ## 参考資料
 
-[Plugins | jQuery Learning Center](https://learn.jquery.com/plugins/ "Plugins | jQuery Learning Center")
+- [Plugins | jQuery Learning Center](https://learn.jquery.com/plugins/ "Plugins | jQuery Learning Center")
 - [jQuery拡張の仕組み 〜 JSおくのほそ道 #013 - Qiita](http://qiita.com/hosomichi/items/29b19ed3ebd0df9361ae)