Minor Release 3.2.0

NOTE: This is the final release of color that uses ES5 syntax. For those following along, 4.0.0 was just released that switches to ES6 (const/let) syntax, which will (at some point) be followed by another major release that further switches to ES Modules entirely. This will be a sweeping change across the color package suite (color, color-string, color-convert). Keep a look out if these issues have been bothering you.

• Bumps color convert to latest (fixes some issues with HCG)
• Bumps mocha to latest