Update .travis.yml to fix 3.7 builds (#349)
Update .travis.yml to fix 3.7 builds (#349)

* Update .travis.yml

Workaround with the pip version

* Test the workaround for the latest pip release

* Update .travis.yml

Use latest succeding configuration

* Additional tests

* Update .travis.yml

Test latest Python3.7 minor release
peterbrittain/asciimatics,peterbrittain/asciimatics