Bump version to 0.28, update changelog.

2 files changed, 37 insertions, 2 deletions

diff --git a/changelog.txt b/changelog.txt
index 4ba1783..6881c13 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,38 @@
+[0.28]
+
+  * Allow unlimited balanced pairs of parentheses in link URLs
+    (@kivikakk, jgm/cmark#166).  The rationale is that there are many URLs
+    containing unescaped nested parentheses.
+  * Change Rule 14 for Emphasis.  Previously the nesting
+    Strong (Emph (...)) was preferred over Emph (Strong (...)).
+    This change makes Emph (Strong (...)) preferred.
+    Note that the commonmark reference implementations
+    were not entirely consistent about this rule, giving
+    different results for
+
+        ***hi***
+
+    and
+
+        ***hi****
+
+    This change simplifies parsing.  It goes against the majority
+    of implementations, but only on something utterly trivial.
+  * Acknowledge Aaron Swartz's role in developing Markdown.
+  * Remove misleading backslash in example for disabling image markup
+    (Matthias Geier).
+  * Fix Unicode terminology (general category, not class)
+    (Philipp Matthias Schaefer).
+  * Add another illustrative case for code spans (#463).
+  * Remove possibly misleading 'either's (#467).
+  * Fix typo (Aidan Woods).
+  * Clarify that some blocks can contain code spans (Matthias Geier).
+  * Fix typo and clarified tab expansion rule (Scott Abbey).
+  * Add a missing "iff" (Matthias Geier).
+  * Add release checklist.
+  * Added npm package for spec (Vitaly Puzrin).
+  * Remove SPEC variable from Makefile.
+
 [0.27]
 
   * Update statement on blank lines and lists (Jesse Rosenthal).
diff --git a/spec.txt b/spec.txt
index 64a60b1..3c81d55 100644
--- a/spec.txt
+++ b/spec.txt
@@ -1,8 +1,8 @@
 ---
 title: CommonMark Spec
 author: John MacFarlane
-version: 0.27
-date: '2016-11-18'
+version: 0.28
+date: '2017-08-01'
 license: '[CC-BY-SA 4.0](http://creativecommons.org/licenses/by-sa/4.0/)'
 ...