Different check for spigot compatibility

src/main/java/me/libraryaddict/disguise/LibsDisguises.java

@@ -70,9 +70,11 @@ public class LibsDisguises extends JavaPlugin {
                     "reloads gracefully!");
         }
 
-        if (Bukkit.getBukkitVersion().startsWith("git-Bukkit-")) {
-            DisguiseUtilities.getLogger()
-                    .severe("Oh dear, you seem to be using CraftBukkit. Please use Spigot or Paper instead! This " +
+        try {
+            Class cl = Class.forName("org.bukkit.Server$Spigot");
+        }
+        catch (ClassNotFoundException e) {
+            getLogger().severe("Oh dear, you seem to be using CraftBukkit. Please use Spigot or Paper instead! This " +
                     "plugin will continue to load, but it will look like a mugging victim");
         }