Update changelog

[ci skip]

Author: 23Skidoo

Cabal/changelog

@@ -2,7 +2,7 @@
 
 1.23.x.x (current development version) 
 	* Deal with extra C sources from preprocessors (#238).
-	* Include cabal_macros.h when running c2hs.
+	* Include cabal_macros.h when running c2hs (#2600).
 
 1.22.0.0 Johan Tibell <johan.tibell@gmail.com> January 2015
 	* Support GHC 7.10.