What's new in pyatspi2 0.3.3:

* Hyperlink fixes.

* When an object's parent is set to null, remove it from the parent in
the cache.

* Fix an issue where a state-changed handler can be called before the
cache received the signal and updated the state.

* Only range check for __getitem__, not getChildAtIndex.  This is
pyatspi-corba's behavior and should improve performance in some cases.

* Fix tracebacks when checking some event properties.

* Fix a traceback when simulating a defunct state for an object that has
gone away.

* Fix traceback when calling queryDocument.getAttributes(),
queryText().getCharacterExtents(), and queryValue().setCurrentValue().

* Fix handling of some ChildrenChanged signals sent by Firefox.