Update docs after building Travis build 2555 of regro/regolith
Update docs after building Travis build 2555 of
regro/regolith

The docs were built from the branch 'master' against the commit
7c0a662f661312eaf149b59079deb60377a9aaa6.

The Travis build that generated this commit is at
https://app.travis-ci.com/regro/regolith/jobs/565424099.

The doctr command that was run is

    /home/travis/miniconda/envs/test/bin/doctr deploy . --deploy-repo ergs/regolith-docs --built-docs ./docs/_build/html

scopatz/regolith-docs,scopatz/regolith-docs