Add blurb

Author: jaraco

Misc/NEWS.d/next/Library/2021-03-07-18-54-39.bpo-43428.br0XmX.rst

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+Include changes from `importlib_metadata 3.7
+<https://importlib-metadata.readthedocs.io/en/latest/history.html#v3-7-0>`_:
+
+- Performance enhancements to distribution discovery. - ``entry_points``
+only returns unique distributions. - Introduces new ``EntryPoints`` object
+for containing a set of entry points with convenience methods for selecting
+entry points by group or name.  ``entry_points`` now returns this object if
+selection parameters are supplied but continues to return a dict object for
+compatibility. Users are encouraged to rely on the selection interface. The
+dict object result is likely to be deprecated in the future. - Added
+packages_distributions function to return a mapping of packages to the
+distributions that provide them.