Updated TODO for possible tailProcessLog() issue reported by Chris.

TODO.txt

@@ -14,6 +14,10 @@
 - Subprocess logging appears to stop when the subprocess moves to the "killing"
   state.  Reported to the mailing list by Nicolas Grilly on 2008-04-13.
 
+- supervisor.tailProcessLog() may return too many bytes when the number of
+  bytes requested exceeds the number logged.  This is not certain and needs
+  investigation.  Reported by Chris McDonough.
+
 - Supervisorctl tab completion and history.
 
 - Supervisorctl "debug" command (communicate with a process over its stdin).