[core-workflow] CircleCI or Travis?

[Brett Cannon]

https://github.com/brettcannon/cpython-ci-test has configurations for both
CircleCI and Travis. If I'm missing something in either configuration then
please let me know (e.g. there is still a free container to use on
CircleCI). If I also missed a better CI service then also let me know (but
I don't think I have).

Otherwise please look at the output of both CI services and let it be known
which service you prefer (i.e. +1/+0/-0/-1 for both services). Ignore the
fact that the doc tests are failing as I have fixed that in Python 3.6 and
3.7 already. Consider ease of reading the output, how long it took to build
(e.g. I might turn off macOS support on Travis because they seem to have
under-provisioned those machines), etc.
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