This will fix the issue where the update check will never give a message because the Spigot website API returns back the wrong an old version number.

Technical details of what I fixed:
Found this post with the same issue https://www.spigotmc.org/threads/sp...ng-plugin-version-number.428115/#post-3747608 and I just added the slash to the URL to get Spigot to return back the correct version number. The update check should now function correctly go forward.