Value maps with "on" and "off" human-readable values are published to MQTT as "True" and "False"

[tjhowse]

  - pub_topic: "load_control/on_off"
    value_map:
      on: 170
      off: 85
    address: 13010

modbus4mqtt/load_control/on_off False

[tjhowse]

Fixed by #17.