Perfmetrics

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- Nothing changed yet.

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- Drop support for obsolete Python versions, including Python 2.7 and
3.6.
- Add support for Python 3.12.

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- Stop accidentally building manylinux wheels with unsafe math
optimizations.
- Add support for Python 3.11.

NOTE: This will be the last major release to support legacy versions
of Python such as 2.7 and 3.6. Some such legacy versions may not have
binary wheels published for this release.

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- Add Windows wheels for 3.9 and 3.10.

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- Add support for Python 3.10.

- Drop support for Python 3.5.

- Add aarch64 binary wheels.

==================

- Add support for Python 3.8 and 3.9.
- Move to GitHub Actions from Travis CI.
- Support PyHamcrest 1.10 and later. See `issue 26
<https://github.com/zodb/perfmetrics/issues/26>`_.
- The ``FakeStatsDClient`` for testing is now always true whether or
not any observations have been seen, like the normal clients. See
`issue <https://github.com/zodb/perfmetrics/issues/23>`_.
- Add support for `StatsD sets
<https://github.com/statsd/statsd/blob/master/docs/metric_types.md#sets>`_,
counters of unique events. See `PR 30 <https://github.com/zodb/perfmetrics/pull/30>`_.