Update HeadingPermalinkRenderer.php #1091
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Added slug delimiter config. I needed slugs to use underscores instead of dashes. I could have extended the SlugNormalizer to do a str_replace as a quick solution for my needs, but the class is final. The library could use this option. (I edited the files in the browser, hence the patches rather than a single pull request. I hope it is going to be useful to somebody.)