Add test in Python 3 on CI #131
Description
Currently running python py/vimlparser.py [--neovim] {testfile} but python seems Python 2 on Travis CI. (#130, https://travis-ci.org/vim-jp/vim-vimlparser/jobs/561431784)
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Currently running python py/vimlparser.py [--neovim] {testfile} but python seems Python 2 on Travis CI. (#130, https://travis-ci.org/vim-jp/vim-vimlparser/jobs/561431784)