Add description of TOUPPER and TOLOWER dialplan functions to CHANGES.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@98811 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -64,6 +64,8 @@ Dialplan functions
   * Added SYSINFO() dialplan function which allows retrieval of system information
   * Added a new dialplan function, DIALPLAN_EXISTS(), which allows you to check for
      the existence of a dialplan target.
+  * Added two new dialplan functions, TOUPPER and TOLOWER, which convert a string to
+     upper and lower case, respectively.
 
 CLI Changes
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