Issue #13815: Resurrect the ExFileObject class.

After a discussion in the tracker, the decision was made to keep the
ExFileObject class after all as a subclass of io.BufferedReader instead of
removing it completely.
diff --git a/Misc/NEWS b/Misc/NEWS
index f27dab5..3b8e3ca 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -26,6 +26,8 @@
 Library
 -------
 
+- Issue #13815: TarFile.extractfile() now returns io.BufferedReader objects.
+
 - Issue #14532: Add a secure_compare() helper to the hmac module, to mitigate
   timing attacks. Patch by Jon Oberheide. 
 
@@ -181,8 +183,6 @@
 Library
 -------
 
-- Issue #13815: TarFile.extractfile() now returns io.BufferedReader objects.
-
 - Issue #14768: os.path.expanduser('~/a') doesn't works correctly when HOME is '/'.
 
 - Issue #14371: Support bzip2 in zipfile module.  Patch by Serhiy Storchaka.