[ci] update travis setup

pyscience-projects / pyevtk

PyEVTK (Python Export VTK) exports data to binary VTK files for visualization/analysis with packages like Paraview, VisIt, and Mayavi.

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Closed renefritze closed 4 years ago

renefritze commented 4 years ago

removes EOL'ed python versions
- switches Travis's base image to the latest (ubuntu bionic)