[frontend] epydoc doesn't like print("foo", file=sys.stderr)
    
    - epydoc is not officially compatible with python3 it seems (?)
    - check_for_anitya_version_updates.py was updated to use additional
    sys.stdout stream for logging. The problem is that for log.error
    and log.exception it should use sys.stderr. I don't know how to
    solve this atm