Use https to clone Github3.py

Using the git protocol makes it hard to fetch the repo if internet
access is only possible via a proxy. An easy fix is using the https
protocol. That way the http_proxy vars on the host are automatically
obeyed and the clone via proxy works.

Change-Id: I18d75b5a16c809ac2d7834e91d32617017aea7f8
1 file changed