Update changelog

Author: Alexandr Evseev

Changelog.md

@@ -1,5 +1,13 @@
 # Echo JS SDK CHANGELOG:
 
+##v3.0.26 - September 18, 2014
+
+* Echo.Canvas can now arrange apps in columns/rows to display apps using
+  custom layout generated by Echo Experience Studio.
+
+* Echo.Utils.stripTags function was re-written to prevent certain types
+  of XSS attacks. Furthermore new version of this function works way faster.
+
 ##v3.0.25 - August 28, 2014
 
 * This release fixes an issue with inaccurate WebSocket connections handling which could lead to unwanted appearance of live updates for one application in other applications on the same page.