Add missing changelog entries.

ChangeLog

@@ -1,6 +1,20 @@
 ChangeLog
 ==========
 
+version 0.4 (released xxxx-xx-xx)
+  * Added a generic way to handle sockets asynchronously.
+  * Added logging of the sftp flags used to open a file.
+  * Added poll() full support and poll-emulation for win32.
+
+version 0.3.1 (released 2009-07-14)
+  * Added return code SSH_SERVER_FILE_NOT_FOUND.
+  * Fixed compilation of SSHv1.
+  * Fixed several memory leaks.
+  * Fixed possible infinite loops.
+  * Fixed a possible crash bug.
+  * Fixed build warnings.
+  * Fixed cmake on BSD.
+
 version 0.3 (released 2009-05-21)
   * Added support for ssh-agent authentication.
   * Added POSIX like sftp implementation.