Specify python version for virtualenv

[WayneKeenan]

Current mainline is python2.

The docs could make it explicit when creating the virtualenv on a host that is defaulting to python3:

virtualenv -p python2 pcbmode-env

[JarrettR]

Use the fork:

https://github.com/threebytesfull/pcbmode/tree/improve-test-coverage

It runs on Python 3, too

[WayneKeenan]

That’s cool. Thanks

Just the docs need to reflect the main point of entry for n00bs, don’t they?

[JarrettR]

I would very much like @saardrimer to merge that branch into mainline!

[saardrimer]

I'm starting to work on the next version of PCBmodE at branch cinco-master.

I understand that for Python 3.5+ we should be using the native venv, so I'll update the docs to reflect that. See also #48 .