Third attempt to fix formatting on README.md diagram.
Third attempt to fix formatting on README.md diagram.

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