Merge remote-tracking branch 'origin/feature/backport-39'. Closes python#96.

Author: jaraco

docs/changelog.rst

@@ -2,6 +2,14 @@
  importlib_resources NEWS
 ==========================
 
+v2.0.0
+======
+
+* Loaders are no longer expected to implement the
+  ``abc.TraversableResources`` interface, but are instead
+  expected to return ``TraversableResources`` from their
+  ``get_resource_reader`` method.
+
 v1.5.0
 ======
 

docs/using.rst

@@ -166,11 +166,11 @@ Both relative and absolute paths work for Python 3.7 and newer.
 Extending
 =========
 
-Starting with Python 3.9 and ``importlib_resources`` 1.3, this package
+Starting with Python 3.9 and ``importlib_resources`` 2.0, this package
 provides an interface for non-standard loaders, such as those used by
-executable bundlers, to supply resources. These loaders should subclass
-from the ``TraversableResources`` abstract class and implement the
-``files()`` method to return a ``Traversable`` object.
+executable bundlers, to supply resources. These loaders should supply a
+``get_resource_reader`` method, which is passed a module name and
+should return a ``TraversableResources`` instance.
 
 
 .. rubric:: Footnotes