[GitHub] [arrow] xhochy opened pull request #2607: ARROW-3301: [Website] Update Jekyll and Bootstrap 4

[GitHub]

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![127 0 0 1_4000_ ipad 
pro](https://user-images.githubusercontent.com/70274/45920083-b2953300-be9f-11e8-84b8-381570ae8245.png)


[ Full content available at: https://github.com/apache/arrow/pull/2607 ]
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