0.28.3.gfm.15

• Escape non-strikethrough tildes (~) in commonmark output (John MacFarlane, #106).
• Cosmetic fix to table HTML output (John MacFarlane, #105).
• Use two tildes for strikethrough CommonMark output (John MacFarlane, #104).
• Normalised header and define names (#109).

0.28.3.gfm.14

• Added a plaintext renderer for strikethrough nodes.

0.28.3.gfm.13

• Footnote rendering bugfix (Michael Camilleri, #90).
• Debian packaging (Joachim Nilsson, #97).
• Add CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE for redcarpet compatibility.
• Add CMARK_OPT_TABLE_PREFER_STYLE_ATTRIBUTES (FUJI Goro, #86, #87).
• Fix pathological nested list parsing (Phil Turnbull, #95).
• Expose more of the extension APIs (Minghao Liu, #96).
• Add python example which uses extensions (Greg Stein, #102).
• Add CMARK_OPT_FULL_INFO_STRING (Mike Kavouras, #103).

0.28.3.gfm.12

• Various security and bug fixes.

0.28.0.gfm.11

• Do not output empty <tbody> in table extension.

0.28.0.gfm.10

• Fix denial of service parsing references.

0.28.0.gfm.9

• Fix denial of service parsing nested links (#49).

0.28.0.gfm.8

• Fix bug where autolink would cause : to be skipped in emphasis
  processing.

0.28.0.gfm.7

• Strikethrough characters do not disturb regular emphasis processing.

0.28.0.gfm.6

• Fix inline sourcepos info when inlines span multiple lines, and in
  ATX headings.