v0.3.0

Changelog

• Migrate renewal script to python3
• Use pyOpenSSL
• Use built-in python arg parser
• Use built-in python logger
• Use a retry session for the queries to the Neutrinet API
• Check the certificate's expiration date before renewing
• Add optional arguments (target directory, verbosity, etc.)
• Move renew_from_cube.py to the Neutrinet Yunohost app
• Merge renew_local.py with renew.py