v4.1.2

Patches

• Ensure NO_COLOR disables colorization if any value is received (#38, #39, #40, #41): ef5d4a8, b329629
  Now properly adheres to the NO_COLOR spec.
  Thank you @stramel and @chocolateboy~!

Chores

• Adds tests to ensure FORCE_COLOR= works as expected (#41): b329629
  Much like NO_COLOR, use of FORCE_COLOR= is expected to be truthy.