Remove pip download cache references
Newest pip versions don't support it anymore and it's been deprecated for a while.
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@ -1,8 +1,6 @@
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language: python
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python: 2.7
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env:
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global:
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- PIP_DOWNLOAD_CACHE="$HOME/.cache/pip"
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matrix:
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- TOX_ENV=pep8
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- TOX_ENV=py26-epolls
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