add Leaf Updater

lib/src/main/java/me/hsgamer/mcserverupdater/UpdateBuilder.java

@@ -46,6 +46,7 @@ public final class UpdateBuilder {
         registerUpdater(PlazmaUpdater::new, "plazma");
         registerUpdater(KaiijuUpdater::new, "kaiiju", "kaiijumc");
         registerUpdater(DivineUpdater::new, "divine", "divinemc");
+        registerUpdater(LeafUpdater::new, "leaf");
     }
 
     private final String project;

lib/src/main/java/me/hsgamer/mcserverupdater/updater/LeafUpdater.java

@@ -0,0 +1,28 @@
+package me.hsgamer.mcserverupdater.updater;
+
+import me.hsgamer.mcserverupdater.api.GithubReleaseUpdater;
+import me.hsgamer.mcserverupdater.util.VersionQuery;
+import org.json.JSONObject;
+
+import java.util.regex.Pattern;
+
+public class LeafUpdater extends GithubReleaseUpdater {
+    public LeafUpdater(VersionQuery versionQuery) {
+        super(versionQuery, "Winds-Studio/Leaf");
+    }
+
+    @Override
+    public Pattern getArtifactPattern() {
+        return Pattern.compile("leaf-[\\d.]+(-mojmap)?\\.jar");
+    }
+
+    @Override
+    public String getDefaultVersion() {
+        return "1.21.1";
+    }
+
+    @Override
+    public JSONObject getReleaseObject() {
+        return getReleaseByTag("ver-" + version);
+    }
+}