travelmate: release 0.4.0

travelmate: release 0.4.0

* add an "active mode", where travelmate will be restarted
  every n seconds (default 60) and checks existing uplink connection
  regardless of ifdown event trigger (disabled by default)
* enhance multiple radio support
    * fix the ap detection
    * respect different radios during scanning & connection handling
* cosmetics

Signed-off-by: Dirk Brenken <dev@brenken.org>