v8.1.0

Changes

• Add new -m/--minimal-headers option to set the minimal number of headers required to compute a hash. Closes {issue}943.
• Validate number of --hash-header options against --minimal-headers value.
• Require at least one header to be provided to the --hash-header option.
• Add installation instructions for brew on macOS and Arch Linux.
• Use mixin classes to share common code between mailbox types and avoid dynamic inheritance.

🐍 Available on PyPi.