Update Supervisor 4 changelog with 3.1.1 release

CHANGES.txt

@@ -25,18 +25,28 @@
   [spec naming lots of processes]" both now complete much more quickly.  See
   https://github.com/Supervisor/supervisor/issues/131 .
 
-- Prevent a crash when a greater number file descriptors were attempted to be
-  opened than permitted by the environment when starting a bunch of programs.
-  Now, instead a spawn error is logged.  See
-  https://github.com/Supervisor/supervisor/issues/145
-
 - Allow > 1023 file descriptor by using poll/kqueue on platforms which support
   it.  See https://github.com/Supervisor/supervisor/pull/129.  Patch by Igor
   Sobreira.
 
+3.1.1 (2014-08-11)
+------------------
+
 - Fixed a bug where ``supervisorctl tail -f name`` output would stop if log
   rotation occurred while tailing.
 
+- Prevent a crash when a greater number file descriptors were attempted to be
+  opened than permitted by the environment when starting a bunch of programs.
+  Now, instead a spawn error is logged.
+
+- Compute "channel delay" properly, fixing symptoms where a supervisorctl start
+  command would hang for a very long time when a process (or many processes)
+  are spewing to their stdout or stderr.  See comments attached to
+  https://github.com/Supervisor/supervisor/pull/263 .
+
+- Added docs/conf.py, docs/Makefile, and supervisor/scripts/*.py to
+  the release package.
+
 3.1.0 (2014-07-29)
 ------------------