- Update to version 0.19.0
  * Trio now supports Python 3.10. (#1921)
  * Use slots for `~.lowlevel.Task` which should make them slightly
    smaller and faster. (#1927)
  * Make `~.Event` more lightweight by using less objects (about 2
    rather than 5, including a nested ParkingLot and attribute
    dicts) and simpler structures (set rather than OrderedDict).
    This may benefit applications that create a large number of
    event instances, such as with the "replace event object on
    every set()" idiom. (#1948)
  * The event loop now holds on to references of coroutine frames
    for only the minimum necessary period of time. (#1864)
  * The `~.lowlevel.TrioToken` class can now be used as a target of
    a weak reference. (#1924)
- Release 0.18.0
  * Add synchronous .close() methods and context manager (with x)
    support for .MemorySendChannel and .MemoryReceiveChannel.
    (#1797)
  * Previously, on Windows, Trio programs using thousands of
    sockets at the same time could trigger extreme slowdowns in the
    Windows kernel. Now, Trio works around this issue, so you
    should be able to use as many sockets as you want. (#1280)
  * `trio.from_thread.run` no longer crashes the Trio run if it is
    executed after the system nursery has been closed but before
    the run has finished. Calls made at this time will now raise
    trio.RunFinishedError. This fixes a regression introduced in
    Trio 0.17.0. The window in question is only one scheduler tick
    long in most cases, but may be longer if async generators need
    to be cleaned up. (#1738)
  * Fix a crash in pypy-3.7 (#1765)

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