Let's integrate the project in Travis CI for testing and linint.
I have already tested it in my fork.
See https://travis-ci.com/github/gribok/coronavirus-tracker-api/builds/154176948 for an example

On every PR, Travis-CI will check automatically the change and feedback it into the PR.

I will push the baseline travis-file per PR.

But you need to activate it in Travis (very easy), because I am not the owner. :-)
The mandatory option Build pushed pull requests have to be activated.