Allow collection of changelog entries headed by a markdown title

[OldhamMade]

It would be great if there could be an option/flag to capture changelog entries that where headed with a markdown title instead of the [changelog] header.

For example:

## Changelog
added: some addition you made that you want in your changelog
changed: some change you made that you want in your changelog
deprecated: some deprecation notice you want in your changelog
removed: some removal you want in your changelog
fixed: some fix you want in your changelog
security: some security fix you want in your changelog

This would help with collecting changelog entries created in Github PR descriptions that use markdown for formatting, which often become git commit messages when merged.