Enable use with cryptography 39+ using new RSA validation skip parameter

[colindean]

…and cleans up the code with some logging statements.

Fixes #3

[thenger]

Thank you for that.
I might add my point of view:
I think adding "..." at end of logs is not a good thing

Even if it will probably never work I think you can add an option to set unsafe_skip_rsa_key_validation=False

This new change (the fact that we explicitly tell not to verify the key) should be explained in the README

thank you for removing the trailing whitespace <3

Regards