Unstable branch chosen for:
* Add support for ROLE_CONTENT_DELETION and ROLE_CONTENT_INSERTION.
ChangeLog:
* Fix arguments in text.addSelection.
* Fix default kind value for registerKeystrokeListener.
* Document that extents are only meaningful when the accessible is both
visible and showing.
* Add accessibleId property.
* Add text.notifyReadingPosition.
* Fix print usage in example, for python 3 compatibility.
What's new in pyatspi 2.31.2:
* Add ScrollSubstringTo and ScrollSubstringToPoint text interfaces.
What's new in pyatspi 2.31.1:
* Add support for locking/unlocking modifiers.
What's new in pyatspi 2.29.1:
* Add ScrollTo and ScrollToPoint component interfaces.
What's new in pyatspi 2.25.90:
* registry: Rename async keyword for compatibility with Python 3.7.
* Add missing XY_PARENT export.
What's new in pyatspi 2.25.3:
* Add error-message, error-for, details, and details-for relation types
What's new in pyatspi 2.25.2:
* Add some missing roles to correspond with atk (description list,
description term, description value, and footnote).
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