Log Message:
textproc/ruby-kramdown: update to 2.2.1

Update ruby-kramdown to 2.2.1.

pkgsrc change
* Add missing denendency to textproc/ruby-rexml.
* Add "USE_LANGUAGES=	# none".

kramdown 2.2.1 released (2020-04-23)

Changes

1 bug fix:

* Don't set role=doc-toc in HTML converter because it is invalid for ul/ol
  (fixes #653 by XhmikosR)

kramdown 2.2.0 released (2020-04-22)

This release is a hotchpotch of many small, internal changes, some minor
user visible changes and a few bug fixes. Special thanks to Ashwin Maroli
for his many contributions!

Changes

5 minor changes:

* Change output of MathJax math engine to be compatible with MathJax v2 and
  v3 (fixes issue #626 by Abe Voelker) and wrap it in <div>/<span> \ 
tags for
  attribute assignment (fixes issue #533 by Luc J. Bourhis)

* Make rexml a dependency due to it not being a default gem in the future
  (PR #638 by David Rodriguez)

* Add WAI-ARIA role attributes to TOC and footnotes HTML (PR #646 by Maxime
  Kjaer)

* Remove redundant line breaks in HTML output for CJK scripts (fixes issue
  #587, PR #588 both by Fangyi Zhou); can be enabled via the new option
  remove_line_breaks_for_cjk

* Several internal changes with respect to memory usage and performance (PRs
  #600, #601, #621, #619, #641, #642, #597, #578, #598, #596 by Ashwin
  Maroli)