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由 Alex Crichton 提交于
Looks like Travis [has announced][blog] that our current `xcode8.2` image is being deprecated and the recommended Xcode 7 image is `xcode7.3`. This updates us to these ahead of time to make sure we can shake out any bugs, if any. [blog]: https://blog.travis-ci.com/2017-10-16-a-new-default-os-x-image-is-coming
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