Remove TODO from list tests which now pass!
Thank yak1ex for list improvements in the change log
v1.321

    - Improved list handling including support for ordered (numbered)
      and nested lists.  Thanks Yasutaka ATARASHI!
No escapes for code in spellchecker
Move duplicate escape/interpolate logic to a method

The only remaining call to _escape() (rather than _escape_non_code())
was in the heading which Peter Vereshagin just fixed
by copying the logic from textblock().

So make it a method to slim down the two places using it.
Document petr999's fix for escaped code chars in headers
Mention the gh issue number when thanking yak1ex

Make the line consistent with others.
v1.322

    - Fix incorrect escaping of characters
      that are inside inline code blocks in headers.
      Thanks to Peter Vereshagin for the pull req (gh-3).