Pytest-xdist

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Bug Fixes
---------

- `344 <https://github.com/pytest-dev/pytest-xdist/issues/344>`_: Fix issue where Warnings could cause pytest to fail if they do not set the args attribute correctly.

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Bug Fixes
---------

- `341 <https://github.com/pytest-dev/pytest-xdist/issues/341>`_: Fix warnings transfer between workers and master node with pytest >= 3.8.

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Features
--------

- `330 <https://github.com/pytest-dev/pytest-xdist/issues/330>`_: Improve collection performance by reducing the number of events sent to ``master`` node.

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Bug Fixes
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- `321 <https://github.com/pytest-dev/pytest-xdist/issues/321>`_: Revert change that dropped support for ``pytest<3.4`` and require ``six``.

This change caused problems in some installations, and was a mistaken
in the first place as we should not change version requirements
in bug-fix releases unless they fix an actual bug.

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Bug Fixes
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- `305 <https://github.com/pytest-dev/pytest-xdist/issues/305>`_: Remove last references to obsolete ``py.code``.

Remove some unnecessary references to ``py.builtin``.

- `316 <https://github.com/pytest-dev/pytest-xdist/issues/316>`_: Workaround cpu detection on Travis CI.

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Bug Fixes
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- Fix issue of virtualized or containerized environments not reporting the number of CPUs correctly. (`9 <https://github.com/pytest-dev/pytest-xdist/issues/9>`_)


Trivial Changes
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- Make all classes subclass from ``object`` and fix ``super()`` call in ``LoadFileScheduling``; (`297 <https://github.com/pytest-dev/pytest-xdist/issues/297>`_)