bootstrap-bibtex python 2->3 issue

[karinsandstrom]

In your own words: "if a Python program has issues with extra little b''s around things, that's something related to the transition from Python 2 to Python 3 and the joyous "unicode/bytes" distinction. The wltools bootstrap command isn't one that I exercise often so it's not surprising that it has a bug with that."

[pkgw]

Thanks for formalizing this into an issue!

Apparently the bootstrap command is emitting output with individual lines encased in b'...'.