example config wrong format

[livexia]

    EXAMPLE_CONF = '''{
    "http_port": 7890,
    "socks5_port": 7891,
    "redir_port": 7892,
    "mixed_port": 7893,
    "allow_lan": true,
    "external_controller": "127.0.0.1:9090",
    "subscribe_url": "",
    "is_subscribe_banned": false,
    "custom_rules": [],
    "mmdb_file_url": "http://www.ideame.top/mmdb/Country.mmdb",
    "mmdb_version_url: "http://www.ideame.top/mmdb/version",
    "periodically_update": false
}
'''

"mmdb_version_url: "http://www.ideame.top/mmdb/version", missing a right double quote