Issue #22638: SSLv3 is now disabled throughout the standard library.
It can still be enabled by instantiating a SSLContext manually.
PEP 479:  Don't let StopIteration bubble out of calls to next() inside a generator.
PEP 479:  Use the return-keyword instead of raising StopIteration inside a generators.
Null merge
Issue #22894: TestCase.subTest() would cause the test suite to be stopped when in failfast mode, even in the absence of failures.
Issue #22894: TestCase.subTest() would cause the test suite to be stopped when in failfast mode, even in the absence of failures.
Update importlib.h
document that cadefault does nothing now
merge 3.4
don't require OpenSSL SNI to pass hostname to ssl functions (#22921)

Patch by Donald Stufft.
merge 3.4 (#22921)
correct versionchanged version
merge 3.4 (null)
add NEWS note for #22921
merge 3.4
add context parameter to HTTPHandler (closes #22788)
merge 3.4 (#22788)
update versionchanged
Issue #22934: Update the comment to mention Programs/_freeze_importlib.c.
Issue #20351: Add examples for csv.DictReader and csv.DictWriter.

Patch by Charles-Axel Dein.