Update update-tles

-N saves bandwidth and server load, only downloads when there is a new TLE available
--progress=dot:binary makes output more script friendly

update-tles

@@ -1,5 +1,5 @@
 #!/bin/sh
 for a in galileo gps-ops beidou glo-ops active
 do
-	wget --backups=1 https://www.celestrak.com/NORAD/elements/$a.txt
+	wget -N --progress=dot:binary --backups=1 https://www.celestrak.com/NORAD/elements/$a.txt
 done