added update checker toast

src/main/java/anticope/rejects/utils/UpdateUtil.java

@@ -0,0 +1,36 @@
+package anticope.rejects.utils;
+
+import com.google.gson.JsonObject;
+import net.minecraft.item.Items;
+
+import net.fabricmc.loader.api.FabricLoader;
+import anticope.rejects.MeteorRejectsAddon;
+import meteordevelopment.meteorclient.utils.network.Http;
+import meteordevelopment.meteorclient.utils.render.MeteorToast;
+
+import static meteordevelopment.meteorclient.MeteorClient.mc;
+
+public class UpdateUtil {
+    private static boolean firstTimeTitleScreen = true;
+    private static final String TAGNAME = "latest-1.18";
+
+    public static void checkUpdate() {
+        if (!firstTimeTitleScreen) return;
+        firstTimeTitleScreen = false;
+
+        MeteorRejectsAddon.LOG.info("Checking for Meteor Rejects update...");
+        
+        String gitHash = FabricLoader
+            .getInstance()
+            .getModContainer("meteor-rejects")
+            .get().getMetadata()
+            .getCustomValue("updater:sha")
+            .getAsString().trim();
+
+        JsonObject tag = Http.get("https://api.github.com/repos/AntiCope/meteor-rejects/git/ref/tags/"+TAGNAME).sendJson(JsonObject.class);
+        if (tag.get("object").getAsJsonObject().get("sha").getAsString().trim() == gitHash) return;
+
+        mc.getToastManager().add(new MeteorToast(Items.BARRIER, "New Rejects update.", "Download it from Github", 8000));
+    }
+
+}