Correctly handle XML in KoralQuery highlighter

Change-Id: Id3f53e8409c2f898c6585e58e0a66563aeec0d13
diff --git a/Changes b/Changes
index 2294ffc..466e752 100755
--- a/Changes
+++ b/Changes
@@ -1,4 +1,4 @@
-0.31 2018-11-20
+0.31 2018-11-30
         - Update to Mojolicious >= 8.06.
         - Made Authentication/Authorization a separated Kalamar::Plugin::Auth
           (deprecated most helpers from Kalamar::Plugin::KalamarUser).
@@ -6,6 +6,7 @@
         - Introduce 'sidebar' content_block.
         - Introduce 'headerButtonGroup' content_block.
         - Added corpusByMatch assistant (#27).
+        - Fixed XML fragment serialization in KQ highlighter.
 
 0.30 2018-11-13
         - Rewrote backend: