Updated changelog for v0.03-beta

Changes.md

@@ -3,15 +3,16 @@ WebPerl Changelog
 =================
 
 
-Not yet released: v0.03-beta
-----------------------------
+2018-08-14: v0.03-beta
+----------------------
 
 - Fixed an issue with WebPerl::JSObject::toperl()
   where JS objects were not being converted properly.
 - Added AJAX demo
 - Added WebPerl autoloading for script tags
-- Various small changes and enhancements (not user-visible)
-- ...
+- Various small changes, bugfixes and enhancements
+  (mostly not user-visible)
+- Added `runtests.html` and `experiments` dir
 
 
 2018-08-12: v0.01-beta