added update checker toast

src/main/java/anticope/rejects/mixin/TitleScreenMixin.java

@@ -0,0 +1,25 @@
+package anticope.rejects.mixin;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import net.minecraft.client.gui.screen.TitleScreen;
+import net.minecraft.client.util.math.MatrixStack;
+
+import anticope.rejects.utils.RejectsConfig;
+import anticope.rejects.utils.UpdateUtil;
+import meteordevelopment.meteorclient.utils.network.MeteorExecutor;
+
+@Mixin(value = TitleScreen.class)
+public class TitleScreenMixin {
+    @Inject(method = "render", at = @At("TAIL"))
+    private void onRender(MatrixStack matrices, int mouseX, int mouseY, float delta, CallbackInfo info) {
+        if (RejectsConfig.get().checkForUpdates) {
+            MeteorExecutor.execute(() -> {
+                UpdateUtil.checkUpdate();
+            });
+        }
+    }
+}