Update MangareadRepository.kt

app/src/main/java/org/koitharu/kotatsu/core/parser/site/MangareadRepository.kt

@@ -99,8 +99,8 @@ class MangareadRepository(
 		val root2 = doc.body().selectFirst("div.content-area")
 			?.selectFirst("div.c-page")
 			?: throw ParseException("Root2 not found")
-		val mangaId = doc.getElementsByAttribute("data-postid").firstOrNull()
-			?.attr("data-postid")?.toLongOrNull()
+		val mangaId = doc.getElementsByAttribute("data-post").firstOrNull()
+			?.attr("data-post")?.toLongOrNull()
 			?: throw ParseException("Cannot obtain manga id")
 		val doc2 = loaderContext.httpPost(
 			"https://${getDomain()}/wp-admin/admin-ajax.php",
@@ -169,4 +169,4 @@ class MangareadRepository(
 					it.substring(0, pos) to it.substring(pos + 1)
 				}.toMutableMap()
 	}
-}
+}