bug: Fix <hr> insertion before styled non-empty <p>
Fix <hr> insertion on double <p>
Merge pull request #34 from y-lohse/gh-27-hr-broken-on-styled-nodes

Fix <hr> insertion on double <p>
Merge pull request #31 from mduvall/gh-27-hr-broken-on-styled-nodes

bug: Fix <hr> insertion before styled non-empty <p>