Here is an inevitably incomplete list of MUCH-APPRECIATED CONTRIBUTORS --
people who have submitted patches, reported bugs, added translations, helped
answer newbie questions, and generally made PyTweening that much better:

Al Sweigart (al@inventwithpython.com)
Denilson Figueiredo de Sá https://github.com/denilsonsa
Julien Schueller https://github.com/jschueller
Marek Madejski https://github.com/TrangOul
Stefanie Molin https://github.com/stefmolin