Raspberry Pi 3A+ Revision 1.1 not yet supported by rpi_ws281x

[presinnovation]

I have created PR #531 over on that repo jgarff/rpi_ws281x#531 to add the Rev 1.1 board to the supported hardware so assuming that gets approved, it would be great if this project could update its dependency version of rpi_ws281x to include that change. FWIW, I found it to be devilishly difficult to get ledcontrol to build using my forked version that added the rev 1.1 support, but maybe I wasn't doing it right.