def meta_headers(text_minutes):
    """Extract the metadata section of a meeting.

    - simple format of Key: Value.
    - Ends with a blank line.
    - Returns a dictionary.
    """
    meta = {}
    lines = text_minutes.split('\n')
    if lines[0] == '---':
        lines.pop(0)
    for line in lines:
        if line.strip() in ['', '---']:
            break
        meta_key, meta_value = line.split(':', 1)
        meta[meta_key.strip().lower()] = meta_value.strip()
    return meta
