Update changelog

Author: sheabunge

CHANGELOG.md

@@ -3,6 +3,8 @@
 ## 2.2.3
 * Fixed broken call to `export_snippet()` function
 * Added support for importing and exporting snippet scope
+* Fixed duplicate primary key database error
+* Improved database table structure
 
 ## 2.2.2
 * Polyfilled array_replace_recursive() function for PHP 5.2

readme.txt

@@ -119,6 +119,8 @@ That's fantastic! Fork the [repository on GitHub](http://github.com/sheabunge/co
 = 2.2.3 =
 * Fixed broken call to `export_snippet()` function
 * Added support for importing and exporting snippet scope
+* Fixed duplicate primary key database error
+* Improved database table structure
 
 = 2.2.2 =
 * Polyfilled array_replace_recursive() function for PHP 5.2