Bumping version number to 3.2.1

Merge branch 'master' of https://github.com/FastLED/FastLED

MEK: v3.1.8, with fixed version number for library manager

MEK: updating release notes for 3.1.7, including thank-yous

But fix release with preliminary esp32 and teensy 3.6 support

Bumping library version to 3.1.3

updating release notes

Fix build problems that some (but oddly, not all) people were having …

…with 1.5.8.

Bumping version number and updating notes

Fix Issue FastLED#89, disable the max power indicator pin.