Add changelog entry for 1a2856eb6e2f024af596e3cca99baabc7004938b

Conflicts:
	CHANGES.txt

CHANGES.txt

@@ -5,6 +5,9 @@
   [spec naming lots of processes]" both now complete much more quickly.  See
   https://github.com/Supervisor/supervisor/issues/131 .
 
+- Environment variables are now be expanded for all config file options.
+  Patch by Dexter Tad-y.
+
 3.1.2 (2014-09-07)
 ------------------