Context

Currently, a Conventional Commit is only marked as "breaking" in cases where the user added a ! in the commit subject, i.e.:

feat!: this is a breaking change

However, the Conventional Commits specification also allows users to provide a git-trailer in the footer;

feat: this is a breaking change

BREAKING-CHANGE: description of the breaking change

NOTE: The specification allowes the usage of BREAKING CHANGE (without -) as well.

Proposal

• Implement support for breaking down the commit message's footer into key-value pairs
• Mark a Conventional Commit as breaking in all above use cases.