Adding python3 docker build to travis
Adding python3 docker build to travis

vincent-noel/SigNetSim,vincent-noel/SigNetSim,vincent-noel/SigNetSim,msreis/SigNetSim,msreis/SigNetSim,msreis/SigNetSim,msreis/SigNetSim,vincent-noel/SigNetSim