Describe the bug

When overriding special commit types feat and fix, to change their titles for instance, like

[commit_types]
feat = { changelog_title = "🌟 Features" }
fix = { changelog_title = "🐛 Bug Fixes" }

They don't trigger a bump anymore.

Expected behavior

Overriding the title of any of them should not default all other flags of their CommitConfig to false

Additional context

A workaround is to explicitly add the bump trigger flag in the custom config like

[commit_types]
feat = { changelog_title = "🌟 Features", bump_minor = true }
fix = { changelog_title = "🐛 Bug Fixes", bump_patch = true }

but a user should probably not have to do that, unless specified in the documentation that this is the way and mandatory when one wants to override the title of a special commit type.

The way it is implemented does not permit to easily merge the custom config with the default one and I'm not good enough in Rust yet to suggest something in a PR, sorry.