Blacklist Spigot-758abbe

- Blacklisted version 758abbe of Spigot. This version contained an NBT-related bug that caused some serious issues. When loading the plugin on this version, the intialization process is aborted and you won't be able to craft or otherwise obtain any new ArmoredElytras.

src/main/java/nl/pim16aap2/armoredElytra/ArmoredElytra.java

@@ -59,6 +59,16 @@ public class ArmoredElytra extends JavaPlugin implements Listener
         }
 
         nbtEditor = minecraftVersion.isNewerThan(MinecraftVersion.v1_15) ? new NBTEditor() : new NBTEditor_legacy();
+        if (isBlacklistedVersion())
+        {
+            myLogger(Level.SEVERE,
+                     "You are trying to run this plugin on a blacklisted version of Spigot! Please update Spigot!");
+            Bukkit.getPluginManager().registerEvents(
+                new LoginHandler(this, ChatColor.RED +
+                    "[ArmoredElytra] The plugin failed to start because you are running on a " +
+                    "blacklisted version of Spiogt! Please update Spigot!"), this);
+            return;
+        }
 
         config = new ConfigLoader(this);
         messages = new Messages(this);
@@ -120,6 +130,24 @@ public class ArmoredElytra extends JavaPlugin implements Listener
         }
     }
 
+    /**
+     * Checks if the current version is blacklisted.
+     * <p>
+     * This is needed for 1.16, as on the initial release there was a bug with NBT stuff that would crash clients when
+     * they saw an Armored Elytra. When they obtained one using a command they wouldn't be able to rejoin the game again
+     * until an NBTEditor was used to remove the item from their inventory.
+     *
+     * @return True if the current version is blacklisted.
+     */
+    public boolean isBlacklistedVersion()
+    {
+        if (minecraftVersion != MinecraftVersion.v1_16)
+            return false;
+
+        String[] parts = Bukkit.getVersion().substring("git-Spigot-".length()).split("-");
+        return parts.length > 0 && parts[0].equals("758abbe");
+    }
+
     public Messages getMyMessages()
     {
         return messages;