Issue with celery naming conventions

[ClaytonPerroni]

currently in the celery release there is an issue with naming an import async which is a reserved keyword. This can be resolved by adding the following to the dockerfile
RUN pip install --upgrade https://github.com/celery/celery/tarball/master
for reference here is the issue on celery and a release is planned to fix the issue but in the meantime if anyone is looking for it here