update changelog

h2/src/docsrc/html/changelog.html

@@ -53,6 +53,8 @@ Change Log
 </li><li>Fix DROP ALL OBJECTS and DROP SCHEMA in the presence of tables with computed column dependencies.
 </li><li>Session-temporary LOB's could sometimes accumulate, increasing the size of the DB file until shutdown.
     Now they are cleared out at every commit.
+</li><li>There was a bug where a hash index with more than one column would be silently converted to a regular index.
+    It will now throw an exception.    
 </li></ul>
 
 <h2>Version 1.3.173 (2013-07-28)</h2>