Rename a keypair

        .. code-block:: python

            >>> c.key_rename("bla", "personal")
            {"Was": "bla",
             "Now": "personal",
             "Id": "QmeyrRNxXaasZaoDXcCZgryoBCga9shaHQ4suHAYXbNZF3",
             "Overwrite": False}

        Parameters
        ----------
        key_name : str
            Current name of the key to rename
        new_key_name : str
            New name of the key

        Returns
        -------
            dict : List of key names and IDs that have been removed

def key_rename(self, key_name, new_key_name, **kwargs):
        """Rename a keypair

        .. code-block:: python

            >>> c.key_rename("bla", "personal")
            {"Was": "bla",
             "Now": "personal",
             "Id": "QmeyrRNxXaasZaoDXcCZgryoBCga9shaHQ4suHAYXbNZF3",
             "Overwrite": False}

        Parameters
        ----------
        key_name : str
            Current name of the key to rename
        new_key_name : str
            New name of the key

        Returns
        -------
            dict : List of key names and IDs that have been removed
        """
        args = (key_name, new_key_name)
        return self._client.request('/key/rename', args, decoder='json',
                                    **kwargs)