Add news fragment.

Author: jaraco

newsfragments/303.feature.rst

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+The functions
+``is_resource()``,
+``open_binary()``,
+``open_text()``,
+``path()``,
+``read_binary()``, and
+``read_text()`` are un-deprecated, and support
+subdirectories via multiple positional arguments.
+The ``contents()`` function also allows subdirectories,
+but remains deprecated.