Compatibility with HUZZAH32 ESP32#5

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RobinR1 wants to merge 9 commits intoTeamScheire:masterfrom

RobinR1:ESP32compat

Commits on Mar 25, 2019

Add missing information to instructions
RobinR1
authored

Commits on Apr 4, 2019

Change audio amp pin on ESP32
RobinR1
committed