Fixed discord invite link

Merge pull request adafruit#55 from adafruit/black-update

Black reformatting with Python 3 target.

Merge pull request adafruit#54 from adafruit/pylint-update

Ran black, updated to pylint 2.x

Merge pull request adafruit#51 from adafruit/dherrada-patch-1

Moved repository from Travis to GitHub Actions

Merge pull request adafruit#50 from adafruit/dherrada-patch-1

Removed building locally section from README, replaced with documenta…

Merge pull request adafruit#47 from kattni/fix-up

Update repo.

Merge pull request adafruit#46 from jepler/issue45

tone: Work with 4.x, 5.0; AudioOut and PWMAudioOut

Merge pull request adafruit#41 from iraytrace/master

bitcount argument to shift_out()

Merge pull request adafruit#43 from inventhouse/master

map_range ZeroDivisionError

Merge pull request adafruit#40 from dherrada/master

Added library name to example filenames