Changelog update.

Cabal/changelog

 -*-change-log-*-
 
-1.23.x.x (current development version) 
+1.23.x.x (current development version)
 	* Deal with extra C sources from preprocessors (#238).
 	* Include cabal_macros.h when running c2hs (#2600).
 	* Don't recompile C sources unless needed (#2601).
@@ -10,6 +10,7 @@
 	  respetively (GHC's '-fprof-auto-{exported,top}' flags) (#193).
 	* New 'custom-setup' stanza to specify setup deps. Setup is also built
 	  with the cabal_macros.h style macros, for conditional compilation.
+	* Support Haddock response files (#2746).
 
 1.22.0.0 Johan Tibell <johan.tibell@gmail.com> January 2015
 	* Support GHC 7.10.