pip install errors

[btrem]

I get errors running pip install:

ERROR: Cannot install -r requirements.txt (line 12) and html5lib==0.999999999 because these package versions have conflicting dependencies.

The conflict is caused by:
The user requested html5lib==0.999999999
mf2py 1.1.2 depends on html5lib>=1.0.1

ERROR: Cannot install -r requirements.txt (line 12) and requests==2.16.4 because these package versions have conflicting dependencies.

The conflict is caused by:
The user requested requests==2.16.4
mf2py 1.1.2 depends on requests>=2.18.4

I resolved the errors by changing requirements.txt but I don't want to create a pr until I get things working and can be at least somewhat sure that my changes are sane.

[snarfed]

Try again now that #5 is merged?

[btrem]

Yes, the problem was running python 3.1 with code that was expecting 2.7.