Implement basic permission check for message commands

src/main/java/wtf/beatrice/hidekobot/commands/message/HelloCommand.java

@@ -1,10 +1,12 @@
 package wtf.beatrice.hidekobot.commands.message;
 
+import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
 import wtf.beatrice.hidekobot.objects.commands.MessageCommand;
 
 import java.util.Arrays;
 import java.util.LinkedList;
+import java.util.List;
 
 public class HelloCommand implements MessageCommand
 {
@@ -14,6 +16,9 @@ public class HelloCommand implements MessageCommand
         return new LinkedList<>(Arrays.asList("hi", "hello", "heya"));
     }
 
+    @Override
+    public List<Permission> getPermissions() { return null; }
+
     @Override
     public boolean passRawArgs() {
         return false;