Remove six dependency in favor pip's vendored six #1240
Merged
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Allows removing a dependency of pip-tools. The package is already
guaranteed to exist within pip, so might as well use it.
As more and more projects are dropping Python 2 support, they too are
dropping six as a dependency. As more projects drop six, this will
eventually remove the need for projects to pull in six as a transient
dependency.
When pip eventually drops Python 2 support, it will also drop six. When
that day comes, pip-tools can also drop Python 2 support, so the
eventual lack of six should not be an issue.
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