Commitlint config loading not working

I've been debugging `cz-conventional-changelog` trying to determine why is it not grabbing my `commitling.config.js` settings. After changing [`index.js#L45`](https://github.com/commitizen/cz-conventional-changelog/blob/master/index.js#L45) to log errors to the console, I saw this message: `TypeError: commitlintLoad is not a function`. Turns out `@commitlint/load` is not working correctly. Changing [`index.js#L31`](https://github.com/commitizen/cz-conventional-changelog/blob/master/index.js#L31) to `require(@commitlint/load).default`, solves the issue. Seems like something changed in the way the `@commitlint/load` library is being compiled to JS.

It's an easy fix but wanted to confirm if I'm in the right track.