SyntaxWarning on first import

[vreuter]

Upon first import of pypiper (version 0.12.3) in a Python 3.10 REPL, I see a few syntax warnings based on is-based, rather than ==-based, comparison. Could code be changed to avoid that?

pypiper/utils.py:349: SyntaxWarning: "is" with a literal. Did you mean "=="

[donaldcampbelljr]

I believe this is now fixed with 0b430c7