Update pyrsistent requirement from <0.17.0 to <0.20.0

[dependabot]

Updates the requirements on pyrsistent to permit the latest version.

Changelog

Sourced from pyrsistent's changelog.

0.19.1, 2022-10-30

• Fix #159 (through PR #243). Pmap keys/values/items now behave more like the corresponding Python 3 methods on dicts. Previously they returned a materialized PVector holding the items, now they return views instead. This is a slight backwards incompatibility compared to previous behaviour, hence stepping version to 0.19. Thanks @​noahbenson for this!
• Fix #244, type for argument to PVector.delete missing. @​thanks dscrofts for this!
• Fix #249, rename perf test directory to avoid tripping up automatic discovery in more recent setuptools versions
• Fix #247, performance bug when setting elements in maps and adding elements to sets
• Fix #248, build pure Python wheels. This is used by some installers. Thanks @​andyreagan for this!
• Fix #254, #258, support manylinux_2014_aarch64 wheels. Thanks @​Aaron-Durant for this!

0.19.0 - Never released due to issues found on test-PyPI

0.18.1, 2022-01-14

• Add universal wheels for MacOS, thanks @​ntamas for this!
• Add support for Python 3.10, thanks @​hugovk for this!
• Fix #236 compilation errors under Python 3.10.
• Drop official support for Python 3.6 since it's EOL since 2021-12-23.
• Fix #238, failing doc tests on Python 3.11, thanks @​musicinmybrain for this!

0.18.0, 2021-06-28

• Fix #209 Update freeze recurse into pyrsistent data structures and thaw to recurse into lists and dicts, Thanks @​phil-arh for this! NB! This is a backwards incompatible change! To keep the old behaviour pass strict=False to freeze and thaw.
• Fix #226, stop using deprecated exception.message. Thanks @​hexagonrecursion for this!
• Fix #211, add union operator to persistent maps. Thanks @​bowbahdoe for this!
• Fix #194, declare build dependencies through pyproject.toml. Thanks @​jaraco for this!
• Officially drop Python 3.5 support.
• Fix #223, release wheels for all major platforms. Thanks @​johnthagen for helping out with this!
• Fix #221, KeyError obscured by TypeError if key is a tuple. Thanks @​ganwell for this!
• Fix LICENSE file name spelling. Thanks @​ndowens and @​barentsen for this!
• Fix #216, add abstractmethod decorator for CheckedType and ABCMeta for _CheckedTypeMeta. Thanks @​ss18 for this!
• Fix #228, rename example classes in tests to avoid name clashes with pytest.

0.17.3, 2020-09-13

• Fix #208, release v0.17.3 with proper meta data requiring Python >= 3.5.

0.16.1, 2020-09-13

• Add "python_requires >= 2.7" to setup.py in preparation for Python 2.7 incompatible updates in 0.17. This is the last version of pyrsistent that can be used with Python 2.7.

0.17.2 (yanked awaiting proper fix for Python 3 req), 2020-09-09

• Same as 0.17.1 released with more recent version of setuptools to get proper meta data for in place.

0.17.1 (yanked for proper meta data), 2020-09-09

• Restrict package to Python >= 3.5 to not break unpinned Python 2 dependencies. Thanks @​vphilippon for this!

0.17.0 (yanked for Python 2 compatibility), 2020-09-08

• Remove Python 2 support code. This includes dropping some compatibility code and the dependency on

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