removeManagers method
移除管理员
拥有者撤销管理员权限
teamId
群Id
accountList
待撤销的管理员的帐号列表
Implementation
Future<NIMResult<List<NIMSuperTeamMember>>> removeManagers(
String teamId, List<String> accountList) async {
return _platform.removeManagers(teamId, accountList);
}