Update README.md

Merge pull request adafruit#181 from ladyada/master

feather m4 adalogger

Merge pull request adafruit#163 from ladyada/matrixportal

woops forgot these

Merge pull request adafruit#156 from ladyada/neotrinky

neeeooooo trinkey!

Merge pull request adafruit#144 from theacodes/master

Add configuration for Winterbloom Gemini (Castor & Pollux)

Merge pull request adafruit#115 from deshipu/master

Add configuration for PewPew M4 board

Merge pull request adafruit#105 from burtyb/commander-1

Add support for Commander board

Merge pull request adafruit#71 from dhalbert/pid-vid-bootloader_board_id

Change BOOTLOADER_BOARD_ID to be USB VID+PID

Merge pull request adafruit#64 from adafruit/pybadge_lc

Small change to avoid compiler warning

touch up version location