python3 support
There seem to be problem with running hg-git with python3 (which is used for recent versions of mercurial - in my case 5.3.1).
*** failed to import extension hggit from /home/arthur/local/hg-git/hggit: No module named 'compat'
A workaround we found was to install it in a virtualenv with a python2 version of mercurial.