Update software/arduino-xmega/README.md

URL for update instructions just in case it was needed.
HelsinkiHacklab · Feb 3, 2013 · c23fefc · c23fefc
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 2. Under the installation directory in `hardware/xmegaduino/variants` symlink/copy the directories from the variants directory in this repo
 3. Under the installation directory in `hardware/xmegaduino/` to `board.txt` add (to end of file) the contents of `add_to_boards.txt`
 
-I (rambo) updated the AVR toolchain but I'm not 100% it's required.
+I (rambo) [updated](https://github.com/rambo/arduino-tiny/tree/attiny1634/avr-gcc) the AVR toolchain but I'm not 100% it's required.
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