Because it's nice to see the most recent changes on top

* Order the changelog in descending order
* Use a level 2 heading for each release
* Changelog contents are unchanged
Merge pull request #154 from theodorejb/improve-changelog

Because it's nice to see the most recent changes on top
Allow watch on multiple directories rather than a single directory
Merge pull request #155 from DocVox/master

Allow watch on multiple directories rather than a single directory
Update CHANGELOG.md