Allow defining custom conventional commit types

[pcfreak30]

I found today this seems to be hard coded?

    let commit_description_change_type = if commit.breaking() && !has_breaking_footer {
        ChangeType::Breaking
    } else if commit.type_() == Type::FEAT {
        ChangeType::Feature
    } else if commit.type_() == Type::FIX {
        ChangeType::Fix
    } else {
        return changes; // The commit description isn't a change itself, only (maybe) footers were.
    };

git-conventional-0.12.9/src/commit.rs seems to support REFACTOR, but there is no way to configure this... on what types detected to be triggering a change on?