Fix build

build.gradle.kts

@@ -72,7 +72,7 @@ allprojects {
     version = Versions.project
 
     repositories {
-        mavenLocal()
+        // mavenLocal() // cheching issue cause compiler exception
         // maven(url = "https://mirrors.huaweicloud.com/repository/maven")
         jcenter()
         maven(url = "https://dl.bintray.com/kotlin/kotlin-eap")

mirai-core-api/src/commonMain/kotlin/contact/Group.kt

@@ -81,7 +81,7 @@ public interface Group : Contact, CoroutineScope {
     /**
      * 群头像下载链接.
      */
-    public val avatarUrl: String
+    public override val avatarUrl: String
         get() = "https://p.qlogo.cn/gh/$id/${id}/640"
 
     /**