Fixed command info message and tab completions (#44)

Author: zefir-git

src/main/java/pro/cloudnode/smp/enchantbookplus/MainCommand.java

@@ -7,21 +7,23 @@
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabCompleter;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 import java.util.Optional;
 
 public final class MainCommand implements CommandExecutor, TabCompleter {
     @Override
     public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String @NotNull [] args) {
-        if (args.length == 1 && args[0].equalsIgnoreCase("reload")) reload(sender, command);
+        if (args.length == 1 && args[0].equalsIgnoreCase("reload"))
+            return reload(sender, command);
         return overview(sender);
     }
 
     @Override
-    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String @NotNull [] args) {
-        return null;
+    public @NotNull List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String @NotNull [] args) {
+        if (sender.hasPermission(Permissions.RELOAD))
+            return List.of("reload");
+        return List.of();
     }
 
     /**