jekyll/jekyll-sitemap — pull request #37 by pathawks (2014-08-29 23:57:07+00:00)
Title: Use `post.last_modified_at` for post lastmod

If **[jekyll-modified-at](https://github.com/gjtorikian/jekyll-last-modified-at)** is installed, use that for a post `` instead of `post.date`

Fixes #18