Commit messages with HTML elements break layout

[y0hami]

If commit subjects have HTML elements it breaks the layout when rendered on the likes of GitHub.

An easy fix for this is to replace all < and > with < and >, this will render as expected and won't break the layout of the document.

Before replacing characters:

After replacing:

I think the easiest way to achieve the suggested fix would be to add a new function here to clean the subject https://github.com/CookPete/auto-changelog/blob/75e5cfe876fa427d908c86d1c6fdbddbc50a9e3d/src/commits.js#L61

This could also be applied to the commit body here in case
it also contains any element references and is used in the changelog https://github.com/CookPete/auto-changelog/blob/75e5cfe876fa427d908c86d1c6fdbddbc50a9e3d/src/commits.js#L62

If you want I am happy to open a PR to apply the fix 🙂

[cookpete]

Fixed in auto-changelog@1.16.1 👍