Please apply 2to3 patch

[tillea]

Hi,
Debian is about to remove Python2 since its is EOL. Thus I have created a patch using 2to3 that should do the porting trick. It would be nice if you would check this out, test it and apply it in your next release.
Kind regards, Andreas.

[HReed1]

I've run into the same issue. I've begun sending pull requests for all instances of Python2 that crash my workflow.

[DavidStreid]

Submitted a PR to update to python3 and compatible pysam syntax. Please feel free to use as a reference for your lab to make the changes. Thank you.

#5