[Docs] mention removal of URI class

see SoCo#238 (comment)

doc/releases/0.10.rst

@@ -69,9 +69,15 @@ Bugfixes
 Backwards Compatability
 =======================
 
-The metadata classes (ML*) have all been renamed (generally to Didl*), and
-aligned more closely with the underlying XML. The Music Services data
-structures (MS*) have been moved to their own module, and metadata for radio
-broadcasts is now returned properly (`#243
-<https://github.com/SoCo/SoCo/pull/243>`_). Work is still ongoing on the
-metadata classes, so further changes should be expected.
+The metadata classes (``ML*``) have all been renamed (generally to ``Didl*``),
+and aligned more closely with the underlying XML. The Music Services data
+structures (``MS*``) have been moved to their own module, and metadata for
+radio broadcasts is now returned properly (`#243
+<https://github.com/SoCo/SoCo/pull/243>`_).
+
+The ``URI`` class has been removed. As an alternative the method
+:meth:`soco.SoCo.play_uri` can be used to enqueue and play an URI. The class
+:class:`soco.data_structures.DIDLObject` can be used if an object is required.
+
+Work is still ongoing on the metadata classes, so further changes should be
+expected.