v1.9.1

This release pulls in security and bug fix updates from nerves_system_br.
Erlang/OTP is now at 22.1.1.

• Bug fixes

  • This system should work out of the box now with Scenic and the offical RPi
    Touchscreen display. The issue preventing it from working has been fixed.

• Updated dependencies

  • nerves_system_br v1.9.4
  • linux - update to the raspberrypi-kernel_1.20190925-1 tag