Missing informations about the differences between hardware versions V1.1 an V1.2

[Taki-B]

Hi!

Thanks for publishing this project but can you add a change log, where we can see what changed from one version to the next one (and why)? As far as I can tell, the PCB hasn't changed, with the exception of the footprint of R4-R6, which replaced C4-C6 in the filter section. Both PCB should be compatible then.

Cheers,

Taki