Bump pyrsistent from 0.16.0 to 0.17.3

[dependabot-preview]

Bumps pyrsistent from 0.16.0 to 0.17.3.

Changelog

Sourced from pyrsistent's changelog.

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.

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 six. Thanks @djailla for this.
• Fix #200, python 3 exception chaining. This is a minor backwards incompatibility, hence stepping to 0.17.0. Thanks @cool-RR for this!

Commits

• cbec3c6 Prepare v0.17.3
• 828cc4e Merge branch 'require-python-2.7'
• 239a9c0 #208 Release 0.16.1 with requirement Python >= 2.7
• 6da48a3 Prepare v0.17.2, same as 0.17.1 but released with more recent version of setu...
• ccc4a34 Prepare v0.17.1
• bb615c0 Merge pull request #206 from vphilippon/python_requires
• 47ab1f3 Add python_requires='>=3.5' to setup.py
• 97190f8 Prepare v0.17.0
• b05a77a Merge pull request #204 from Djailla/version
• c5bd6b1 Prepare version 1.7.0
• Additional commits viewable in compare view

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