update mcbbs link (PotatoCraft-Studio#310)

* fix wrong update link

* update link

* update link

* Update MCBBS Link

Author: YuanYuanOwO

README.md

@@ -48,7 +48,7 @@ from [KaiKikuchi's QuickShop upstream repository](https://github.com/KaiKikuchi/
 
 ## Downloads
 
-| <a href="https://www.spigotmc.org/resources/62575/"><img src="/.github/icons/Spigot.png" width="100" height="90" /></a> | <a href="https://dev.bukkit.org/projects/quickshop-reremake"><img src="/.github/icons/Bukkit.png" width="100" height="100" /></a></a> | <a href="http://www.mcbbs.net/thread-809496-1-1.html"><img src="/.github/icons/MCBBS.png" width="100" height="100" /></a> | <a href="https://ci.codemc.io/job/PotatoCraft-Studio/job/QuickShop-Reremake-SNAPSHOT/"><img src="/.github/icons/Jenkins.svg" width="85" height="100" /></a>
+| <a href="https://www.spigotmc.org/resources/62575/"><img src="/.github/icons/Spigot.png" width="100" height="90" /></a> | <a href="https://dev.bukkit.org/projects/quickshop-reremake"><img src="/.github/icons/Bukkit.png" width="100" height="100" /></a></a> | <a href="https://www.mcbbs.net/thread-1426607-1-1.html"><img src="/.github/icons/MCBBS.png" width="100" height="100" /></a> | <a href="https://ci.codemc.io/job/PotatoCraft-Studio/job/QuickShop-Reremake-SNAPSHOT/"><img src="/.github/icons/Jenkins.svg" width="85" height="100" /></a>
  | :---: | :---: | :---: | :---: |
 | **Spigot** | **BukkitDev** | **MCBBS** | **Jenkins** |