[Python-modules-team] Bug#903525: python3-dropbox fails to install with Python 3.7 as supported version

[Matthias Klose]

Control: tags -1 + patch

the byte-compilation succeeds, even if the module name is async.

packaging for 9.0.0 can be found at
https://launchpad.net/ubuntu/+source/python-dropbox/9.0.0-0ubuntu1