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travis-ci

Cache pip directory between builds

See: https://docs.travis-ci.com/user/caching/

We install `poetry` using `pip`, so caching pip itself will speed up the
installation of `pypoetry`! In our `.travisy.yml`, we might consider
installing `poetry` with a shell script: using `pip` places `poeytry`
(and its deps) into the virtualenv which technically pollutes our
testing venv.

Caching the `.cache/pypoetry` dir will speed up `poetry install` too,
since that's where the venv lives! See:

https://poetry.eustace.io/docs/configuration/#settingsvirtualenvspath-string

This configuration is lifted directly from the `.travis.yml` in `poetry`
itself.

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