Deletes all keys with a prefix of Key.

        Parameters:
            key (str): Key to delete
            separator (str): Delete only up to a given separator
        Response:
            bool: ``True`` on success

async def delete_tree(self, prefix, *, separator=None):
        """Deletes all keys with a prefix of Key.

        Parameters:
            key (str): Key to delete
            separator (str): Delete only up to a given separator
        Response:
            bool: ``True`` on success
        """
        response = await self._discard(prefix,
                                       recurse=True,
                                       separator=separator)
        return response.body is True