add tab reordering to changelog

Changelog

 Gajim 0.10 (XX May 2006)
 
-  * One Messages Window ability (default to it)
+  * One Messages Window ability (default to it) with tab reordering ability
   * Non blocking socket connections. Gajim no longer remains unresponsive.
   * Gajim now uses less memory
   * File Transfer improvements (now should work out of the box for all)