修复sdk错误

im-sdk/src/main/java/com/wecloud/im/sdk/WecloudImClient.java

@@ -256,7 +256,7 @@ public class WecloudImClient implements WecloudIm {
     @Override
     @Override
     public Integer joinGroup(String inviterUserId, String groupId, String userIds) {
     public Integer joinGroup(String inviterUserId, String groupId, String userIds) {
         JoinGroupRequest joinGroupRequest =
         JoinGroupRequest joinGroupRequest =
-                JoinGroupRequest.builder().userIds(userIds).groupId(groupId).build();
+                JoinGroupRequest.builder().inviterUserId(inviterUserId).userIds(userIds).groupId(groupId).build();
         return imGroupOperation.joinGroup(joinGroupRequest);
         return imGroupOperation.joinGroup(joinGroupRequest);
     }
     }