As a package maintainer, I have to exclude the test fixtures in
MANIFEST.in so that they aren't shipped with the package release.
But for the repo, we need to include fixtures, logos and docs so
that Travis can run the tests after running
`pip install ./zulip_bots`.
Also, since we are installing zulip_bots off of this repo in our
main repo, docs and logos should be included so that they can be
rendered alongside our webhooks/integrations documentation, so we
need to include them in MANIFEST.in as well.
To automate this process, I just wrote this handy little script
that future bot contributors can run instead of having to manually
specify what to include in MANIFEST.in in the repo.
