docs: update docker-multifeeder to the maintained ultrafeeder (#9)

readme.md

@@ -143,7 +143,7 @@ A curated list of awesome [ASD-B](https://en.wikipedia.org/wiki/Automatic_Depend
 
 ### Feeding
 
-- [sdr-enthusiasts/docker-multifeeder](https://github.com/sdr-enthusiasts/docker-multifeeder) - Feed multiple ADS-B and MLAT aggregators from a single container.
+- [sdr-enthusiasts/docker-adsb-ultrafeeder](https://github.com/sdr-enthusiasts/docker-adsb-ultrafeeder) - All-in-one ADSB container with readsb, tar1090, graphs1090, autogain, multi-feeder, and mlat-hub built in.
 - [adsbfi/adsb-fi-scripts](https://github.com/adsbfi/adsb-fi-scripts) - Easy to use feeder install script for feeding to adsb.fi.
 - [adsblol/feed](https://github.com/adsblol/feed) - Easy to use, container-based MLAT/ADS-B/ACARS/VDL2 multi feed client. Powered by [SDR-Enthusiasts](https://github.com/sdr-enthusiasts) images.