According to the `setuptools` docs, once `include_package_data=True`
is passed to `setup()`, it will only include package data specified
in `MANIFEST.in`, and will ignore the `package_data` argument passed
to `setup()`. Therefore, `py.typed` was not included in our latest
PyPI release 0.8.1.
Since we specify all of our package data in the `MANIFEST.in` file
already, it makes more sense to include mention `py.typed` there so
that it is included in the expected fashion.
See https://github.com/pypa/setuptools/issues/1461 for background.
Fixes#732.
In order to keep all three packages (zulip, zulip_bots,
zulip_botserver) in the same repo, all package files must now
be nested one level deeper.
For instance, python-zulip-api/zulip_bots/zulip_bots/bots/, instead
of python-zulip-api/zulip_bots/bots/.
