"...0d0cea2424ae97b27447dc64a7dbfae83c036c45b403392f0e8ba.png" did not exist on "pptt_v3"
Python 3
Add Python 3 support using the past package, and its 2to3-based futurize script: https://pypi.org/project/past/
The Travis failure for Python 3 is due to a bug already present with Python 2, and is solved by #280