Explain fix for Raspberry Pi 2 #9
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The Makefile previously didn't create a new gb_common.o if the corresponding .c file was changed. Now it just compiles both files to the hx711 executable.
The code was not working on Raspberry Pi 2 because of changed memory addresses. The README now explains how to fix this.
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The code wasn't working on a Raspberry Pi 2 since the used Gertboard code (gb_common) uses hard-coded memory addresses to access the GPIOs. And the memory mapping has changed between Pi 1 and Pi 2.
This adds an explanation and adds a correct address (commented out) for the Raspberry Pi 2 to gb_common.c. It also fixes the Makefile to recompile gb_common.c.