Merge pull request #4 from linagee/patch-1

Update README.md with required avr-gcc build process

Author: Eric Jennings

README.md

@@ -2,3 +2,6 @@ pinoccio-firmware
 =================
 
 Firmware files, including bootloaders and app hex files for the ATmega16U2 and the ATmega128RFA1 MCUs
+
+As of 8/25/2013, you *MUST* create your own toolchain (avr-gcc, avrdude, etc.) because the Atmega256RFR2 is a fairly new chip and Arduino binaries of these are from 2011 era.
+install-avr-gcc.sh will help you in grabbing and building the newest avr-gcc, avrdude, etc.