fix for python3
fix for python3

dariober/bwa-meth,PeteHaitch/bwa-parclip,dariober/bwa-meth,brentp/bwa-meth,PeteHaitch/bwa-parclip,dariober/bwa-meth,brentp/bwa-meth,brentp/bwa-meth,PeteHaitch/bwa-parclip