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This guy for Dev.Well, since Nephilim tagged me.. The way to update plugins is pretty simple. Effectively, its like updating a server.
First, go to the place where you first defined the .jar file for the original spigot/craftbukkit in your IDE. Here, we will remove the original and add the new one. Finally, update any code that may be broken and/or outdated and in theory - you are good to go.