Pyperf

What's Changed
* Support reporting geometric mean by benchmark tags by mdboom in https://github.com/psf/pyperf/pull/132
* Add pyston as an implementation with a jit by kmod in https://github.com/psf/pyperf/pull/135
* Add support for profiling benchmarks by mdboom in https://github.com/psf/pyperf/pull/134

New Contributors
* mdboom made their first contribution in https://github.com/psf/pyperf/pull/132
* kmod made their first contribution in https://github.com/psf/pyperf/pull/135

**Full Changelog**: https://github.com/psf/pyperf/compare/2.3.1...2.4.0

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* Add a ``Runner.bench_async_func()`` to benchmark an asyncio coroutine.
Patch by Inada Naoki.
* pyperf now recognizes graalpython as the JIT-based implementation.
Patch by Tim Felgentreff.

New Contributors
------------------
* timfel made their first contribution in https://github.com/psf/pyperf/pull/119
* methane made their first contribution in https://github.com/psf/pyperf/pull/124

**Full Changelog**: https://github.com/psf/pyperf/compare/2.3.0...2.3.1

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* pyperf ref:`compare_to command <compare_to_cmd>` now supports the
``--table-format`` option which can designate the table format
between reST and markdown

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* ``--track-memory`` option now supports macOS by using ``psutil``.
* Added ``--copy-env`` command line option that inherits all environment variables.
* The development branch ``master`` was renamed to ``main``.
See https://sfconservancy.org/news/2020/jun/23/gitbranchname/ for the
rationale.