Log Message:
textproc/hs-commonmark: Update to 0.2.4

0.2.4
* Do not parse hard line breaks in fenced codeblock info (#116, Michael
  Howell). This change makes commonmark-hs conform to the spec and behave
  like other implementations when an info string in a code block ends with
  a backslash.
* [API change] Commonmark.Inlines now exports pEscapedSymbol (#116, Michael
  Howell).
* Tokenize combining marks as WordChars not Symbol (#114).