'Remove a user from a group.
:type group_name: string
:param group_name: The name of the group
:type user_name: string
:param user_name: The user to remove from the group.'

def remove_user_from_group(self, group_name, user_name):

    params = {'GroupName': group_name, 'UserName': user_name}
    return self.get_response('RemoveUserFromGroup', params)
