Switch to python3 to close RC bug

Nicholas D Steevesrequested to merge
sten/virtualenv-clone:master into master

Hi @onovy,

Bug #938785 will cause the removal of one of my packages (Elpy). Would you please merge this work? I've insured that it's suitable for a minimal NMU, however I left the -2 version you set unmodified rather than setting it to -1.3.

Thanks! Nicholas

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