This ships out an important bugfix that was missed because release monitoring was not properly set up https://launchpad.net/dkimpy/+announcement/53935

The spec is also modernized - import checks and tests are now run, and extras are shipped as subpackages.

2023-04-30 Version 1.0.6

• Provide more specific error message when ed25519 private key is invalid (See LP 1901569 for background)
• Correct base64 validation regexp so that valid signature with == split between two lines are not incorrectly evaluated as invalid (LP: #2002295) - Thanks to https://launchpad.net/~obadz for the report and the proposed fix
• Fix traceback when attempting to verify an unsigned message using async verify (Thanks to Nikita Sychev for the report and a suggested fix) (LP: #2008723)
• Verify correct AMS header is used for ARC seal verification
• Catch nacl.exceptions.ValueError and raise KeyFormatError, similar to how RSA key errors are treated (LP: #2018021)
• Create ed25519 key files with secure permissions to avoid risk of insecure chmode call/race condition (Thanks to Hanno Böck for the report and the suggested fix) (LP: #2017430)