Couple of cleanups

Author: jriwanek

src/main/java/com/mcmoddev/mmdbot/core/References.java

@@ -63,5 +63,8 @@ public class References {
      */
     public static final String USER_JOIN_TIMES_FILE_PATH = "mmdbot_user_join_times.json";
 
+    /**
+     * The constant STARTUP_TIME.
+     */
     public static Instant STARTUP_TIME;
 }

src/main/java/com/mcmoddev/mmdbot/modules/commands/server/tricks/CmdAddTrick.java

@@ -2,7 +2,6 @@
 
 import com.jagrosh.jdautilities.command.Command;
 import com.jagrosh.jdautilities.command.CommandEvent;
-import com.mcmoddev.mmdbot.MMDBot;
 import com.mcmoddev.mmdbot.core.Utils;
 import com.mcmoddev.mmdbot.utilities.tricks.Tricks;