Update Changelog to match changes since v0.4

Change-Id: I2b191d145b77bf037454a8f09c1cf220e2ad0a82
diff --git a/Changelog b/Changelog
index 8714e72..b1c4fa5 100644
--- a/Changelog
+++ b/Changelog
@@ -1,6 +1,17 @@
 vland 0.5-DEV
 
  * Large numbers of bugfixes and code cleanups
+   + More robust error handling and logging
+ * Lots of improvements to the visualisation code:
+   + Bind to any interface, not just localhost so that the
+     visualisation can be seen from other machines
+   + Add an option to auto-refresh in the browser
+   + Improve error logging
+   + Add caching of graphics for improved performance
+   + Improve compliance with HTTP headers
+   + Add popup tooltips for more information about configuration of ports
+ * Added a special dummy switch driver to help with debugging and testing
+ * In database multi-element calls, sort the output for consistency
 
  -- Steve McIntyre <steve.mcintyre@linaro.org>  Thu, 24 Sep 2015 17:00:03 -0700