Bump futures from 3.0.5 to 3.2.0

[dependabot-preview]

Bumps futures from 3.0.5 to 3.2.0.

Changelog

Sourced from futures's changelog.

3.2.0

• The ThreadPoolExecutor class constructor now accepts an optional thread_name_prefix argument to make it possible to customize the names of the threads created by the pool. Upstream contribution by Gregory P. Smith in https://bugs.python.org/issue27664.
• Backported fixes from upstream (thanks Lisandro Dalcin):

• bpo-27144: concurrent.futures as_complete and map iterators do not keep reference to returned object python/cpython#1560
• Fix a concurrent.futures.as_completed() refleak previously introduced in bpo-27144 python/cpython#3270
• bpo-31641: Allow arbitrary iterables in concurrent.futures.as_completed() python/cpython#3830

3.1.1

• Backported sanity checks for the max_workers constructor argument for ThreadPoolExecutor and ProcessPoolExecutor
• Set the default value of max_workers in ThreadPoolExecutor to None, as in upstream code (computes the thread pool size based on the number of CPUs)
• Added support for old-style exception objects
• Switched to the PSF license

3.1.0

• (Failed release)

Commits

• 9dcbb35 Bumped up the version number
• 13472e6 Modernized the packaging/testing setup
• 7460824 Renamed CHANGES to CHANGES.rst
• 734643b Corrected minor details in packaging metadata
• a4445f0 Added a README
• 718654e Fixed tests hanging on PyPy
• 552ca07 Added notes from PR #66
• 28fa404 Backport fixes to as_completed and map iterators (bpo-27144) (#66)
• d0393ad Specify python_requires to prevent installation on Python 3 (#67)
• 4fcc2e0 Wrap long lines in CHANGES. (#61)
• Additional commits viewable in compare view

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