Update changelog.

Author: scoder

CHANGES.rst

@@ -20,7 +20,7 @@ Lupa change log
   explicitly at need.
   (original patch by Richard Connon)
 
-* The bundled Lua 5.1 was updated to 5.1.5 and Lua 5.2 to 5.2.4.
+* GH#234: The bundled Lua 5.1 was updated to 5.1.5 and Lua 5.2 to 5.2.4.
   (patch by xxyzz)
 
 * The bundled Lua 5.4 was updated to 5.4.6.