v3.4.0

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• Backported bpo-21423: Add an initializer argument to {Process,Thread}PoolExecutor
  (only ThreadPoolExecutor for now; PR by Fahrzin Hemmati)

v3.3.0

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• Backported bpo-24882: Let ThreadPoolExecutor reuse idle threads before creating new thread

v3.2.0

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• 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):

• python/cpython#1560

• python/cpython#3270

• python/cpython#3830

v3.1.1.post1

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v3.1.1

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• 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

v3.1.0

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• (Failed release)

v3.0.5

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• Fixed OverflowError with ProcessPoolExecutor on Windows (regression
  introduced in 3.0.4)

v3.0.4

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• Fixed inability to forcibly terminate the process if there are pending workers

v3.0.3

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• Fixed AttributeErrors on exit on Python 2.x

v3.0.2

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• Made multiprocessing optional again on implementations other than just Jython

v3.0.1

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• Made Executor.map() non-greedy

v3.0.0

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• Dropped Python 2.5 and 3.1 support
• Removed the deprecated "futures" top level package
• Applied patch for issue 11777 (Executor.map does not submit futures until
  iter.next() is called)
• Applied patch for issue 15015 (accessing a non-existing attribute)
• Applied patch for issue 16284 (memory leak)
• Applied patch for issue 20367 (behavior of concurrent.futures.as_completed()
  for duplicate arguments)