Update ChangeLog for v3.23.

ChangeLog

@@ -1,14 +1,30 @@
 # ChangeLog for Pod::Simple dist
 #---------------------------------------------------------------------------
 
-	* Release 3.22
+2012-08-14   David E. Wheeler <david@justatheory.org>
+	* Release 3.23
 
 	Eliminated nested elements in table of contents (index) items
 	output of Pod::Simple::XHTML. This was especially problematic for
 	headers that included links, as the TOC then got nested anchor
 	elements, which simply would not work. Thanks to Ben Bullock for
 	the report and test case (RT #77686).
 
+	Fixed semantically invalid nested XHTML generated by
+	Pod::Simple::XHTML since v3.21. Gisle Aas.
+
+	Improved support for nested "C< >" tags in Pod::Simple::XHTML.
+	Gisle Aas.
+
+	No longer tries to decode a string with the "utf8" flag set, as
+	the double-decoding only triggered an error. Grant McLean.
+
+	Added documentation note that the API expects encoded text
+	(octets). Grant McLean.
+
+	Added "parse_characters()" option to specify that strings to are
+	already decoded from octets into characters. Grant McLean.
+
 2012-05-27   David E. Wheeler <david@justatheory.org>
 	* Release 3.22