add 撤回消息

gim/logic.ext.proto

@@ -182,6 +182,7 @@ message GetGroupReq {
 }
 message GetGroupResp {
   Group group = 1;
+  MemberType member_type = 2;
 }
 
 message Group {
@@ -230,6 +231,7 @@ message DeleteGroupMemberReq {
 
 message GetGroupMembersReq {
   int64 group_id = 1;
+  int64 limit = 2;
 }
 message GetGroupMembersResp {
   repeated GroupMember members = 1;