Replace py3.5 with py3.7 in Travis CI + update to xenial distribution #298
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This PR updates Travis CI to use python 2.7, 3.6 and 3.7 instead of 2.7, 3.5 and 3.6. The main motivation is to start testing against python 3.7 while at the same time keeping the number of checks to be unchanged (9 variants total).
This also updates the linux distribution from
trustytoxenial(required for Python 3.7).