pysam build fails on python3.8

[lincoln-harris]

this is a known issue: jbloomlab/alignparse#58

one way to get around it is perhaps a conda installation of pysam?

[lincoln-harris]

or possibly remove the pysam dependency entirely? its not clear that its being used...could just be vestigal at this point

i've been testing this on #87 -- as far as i can tell all tests pass when pysam is removed from requirements.txt

[lincoln-harris]

@rvanheusden any ideas on what pysam was doing?

[rvanheusden]

I don't know if pysam was ever an actual requirement. It was added in 1e7ea1e along with Biopython, but I don't think it's needed.

[lincoln-harris]

beautiful, thank you

[lincoln-harris]

reopening this, ref #83.

pysam has been removed from requirements.txt and this seems to be working for now, on python 3.6, 3.7, 3.8.
we still very much depend on pysam however.

anticipating this being an issue again in the future, will keep open.