def convert_metadata_1_0_to_1_1(metadata):
    """
    Convert 1.0 to 1.1 metadata format

    :arg metadata: The old metadata
    :returns: The new metadata

    Changes from 1.0 to 1.1:

    * ``supported_by`` field value ``curated`` has been removed
    * ``supported_by`` field value ``certified`` has been added
    * ``supported_by`` field value ``network`` has been added
    """
    new_metadata = {'metadata_version': '1.1',
                    'supported_by': metadata['supported_by'],
                    'status': metadata['status']
                    }
    if new_metadata['supported_by'] == 'unmaintained':
        new_metadata['supported_by'] = 'community'
    elif new_metadata['supported_by'] == 'curated':
        new_metadata['supported_by'] = 'certified'

    return new_metadata