Optimized imports. Changed ServerTickEventHandler to PlayerTickEventHandler and made grace periods are now updated per player.

src/main/java/com/micle/loginprotection/events/OnPlayerTickEventHandler.java

@@ -0,0 +1,14 @@
+package com.micle.loginprotection.events;
+
+import com.micle.loginprotection.LoginProtection;
+import net.minecraftforge.event.TickEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+
+public class OnPlayerTickEventHandler {
+    @SubscribeEvent
+    public void PlayerTickEvent(TickEvent.PlayerTickEvent event) {
+        if (LoginProtection.protected_players.getPlayer(event.player.getUUID()) == null) { return; }
+
+        LoginProtection.protected_players.updateGracePeriod(event.player.getUUID());
+    }
+}