[amsat-bb] Fox-in-a-box downloadable image updated

[Burns Fisher]

An SD card image with the latest FoxTelem (V1.08r)  is now available to
download from http://burnsfisher.com/AMSAT/FoxInABox.  Look at the
readme.txt file for details.  This SD card image is the same as what is
burned on SD cards currently shipping from the AMSAT store.

CAUTION!  It is over 3GB long!  There is a shorter file there (V1.07y) but
it has an older FoxTelem and it does not support Raspberry Pi 4.

Remember, you can also upgrade your existing FIAB SD card to the latest
FoxTelem.  See the text file "Updating FoxTelem on your Fox-in-a-Box.txt"
in the same directory.

73,

Burns WB1FJ