Issue 4920:  Fixed next() vs __next__() issues in the ABCs
for Iterator and MutableSet.  Also added thorough test for
required abstractmethods.
diff --git a/Misc/NEWS b/Misc/NEWS
index 1a39f0e..af0a7ff 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -76,6 +76,9 @@
 Library
 -------
 
+- Issue 4920:  Fixed .next() vs .__next__() issues in the ABCs for
+  Iterator and MutableSet.
+
 - Issue 5021:  doctest.testfile() did not create __name__ and
   collections.namedtuple() relied on __name__ being defined.