Add TableSyntax to CHANGELOG

diff --git a/pkgs/markdown/CHANGELOG.md b/pkgs/markdown/CHANGELOG.md
index 416778a..1a17056 100644
--- a/pkgs/markdown/CHANGELOG.md
+++ b/pkgs/markdown/CHANGELOG.md

@@ -4,6 +4,8 @@
   * `dart bin/markdown.dart --version` now shows the package version number.
   * The playground app now shows the version number.
 * Improve autolink parsing.
+* Added new table syntax: `TableSyntax`. This can be used by passing
+  `const TableSyntax()` to `markdownToHtml()`'s `blockSyntaxes:` argument.
 * For development: added tool/travis.sh.
 
 ## 0.11.0+1