* Add os.add_dll_directory()
* Add memfd_create() and flags
* Add type annotation to flags
* Add stat_result.st_reparse_tag and flags
* Add ncurses_version
* Add Path.link_to()
* Add Picker.reducer_override()
* Add plistlib.UID
* Add has_dualstack_ipv6() and create_server()
* Add shlex.join()
* Add SSL methods and fields
* Add Python 3.8 statistics functions and classes
* Remove obsolete sys.subversion
* Add sys.unraisablehook
* Add threading.excepthook
* Add get_native_id() and Thread.native_id
* Add Python 3.8 tkinter methods
* Add CLOCK_UPTIME_RAW
* Add SupportsIndex
* Add typing.get_origin() and get_args()
* Add unicodedata.is_normalized
* Add unittest.mock.AsyncMock
Currently this is just an alias for Any like Mock and MagicMock. All of
these classes should probably be sub-classing Any and add their own
methods. See also #3224.
* Add unittest cleanup methods
* Add IsolatedAsyncioTestCase
* Add ElementTree.canonicalize() and C14NWriterTarget
* cProfile.Profile can be used as a context manager
* Add asyncio task name handling
* mmap.flush() now always returns None
* Add posonlyargcount to CodeType
* Use variable annotations
* Replace default values by ellipses
* Remove exceptions from function bodies
* Remove superfluous comments
* Remove superfluous newlines
* Use Optional instead of Union[..., None]
* Replace Union[int, float] by just float
* Make time.pyi (Python 2) more closely resemble the Python 3 stub
* Replace _TIME_TUPLE by TimeTuple
* Reorder imports
* time.pyi: Mark two arguments as optional, mark Unix-only function
* time.pyi (Python 2): Use TimeTuple in NamedTuple and reformat
This makes time.pyi more closely match the Python3 version.
* Merge Python 2 and 3 versions of time.pyi
* Only import SimpleNamespace on Python >= 3.3
* Remove default values from module properties
* Remove Optional from strftime() and asctime()
* accept2dyear was removed in Python 3.3
* Rename TimeTuple to _TimeTuple
