be more tolerant of pytest version updates
be more tolerant of pytest version updates

grybmadsci/openhtf,grybmadsci/openhtf,fahhem/openhtf,ShaperTools/openhtf,google/openhtf,ShaperTools/openhtf,grybmadsci/openhtf,google/openhtf,jettisonjoe/openhtf,fahhem/openhtf,ShaperTools/openhtf,ShaperTools/openhtf,fahhem/openhtf,jettisonjoe/openhtf,fahhem/openhtf,ShaperTools/openhtf,jettisonjoe/openhtf,grybmadsci/openhtf,google/openhtf,google/openhtf,jettisonjoe/openhtf