Updated changelog

Author: ishubin

CHANGELOG.md

@@ -9,6 +9,7 @@ All changes to Galen Framework project will be documented in this file
 - Installation script for Mac. Now it creates a symlink in /usr/local/bin/galen
 - Fixed default functions replacement when using $page in GalenPages
 - Added 'singleline' text operation for text validation
+- Added 2 pixels error rate in spec 'inside' when checking that the element is not completely inside another element
 
 
 ## [2.2.1][2015-12-08]