[Crossbow][Python] Run nightly tests against pandas master

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Follow-up of #2758 and #2755

Reporter: Krisztian Szucs / @kszucs
Assignee: Krisztian Szucs / @kszucs

PRs and other links:

• GitHub Pull Request #2943

_{Note: This issue was originally created as ARROW-3710. Please see the migration documentation for further details.}

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Wes McKinney / @wesm:
Issue resolved by pull request 2943
#2943

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Wes McKinney / @wesm:
Let's keep this open until we are confident the community has visibility into whether or not this build is passing

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Krisztian Szucs / @kszucs:
The shortest thing to do, to send emails to dev@arrow

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Wes McKinney / @wesm:
@kszucs how far away are we on this? pandas is continuing to make releases pretty quickly so want to make sure we stay safe =)

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Wes McKinney / @wesm:
Where do we stand on this?

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Krisztian Szucs / @kszucs:
@wesm They are running: https://github.com/kszucs/crossbow/branches/all?query=pandas-master

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Wes McKinney / @wesm:
OK, I'm going to move this to 0.14, and we can resolve once we have a public dashboard of some kind

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Krisztian Szucs / @kszucs:
Now we have nightly emails about the builds, including the pandas-master one.