[!] The spec did not pass validation, due to 1 error.
[!] The validator for Swift projects uses Swift 3.0 by default, if you are using a different version of swift you can use a `.swift-version` file to set the version for your Pod. For example to use Swift 2.3, run:
`echo "2.3" > .swift-version`.
这是因为需要知道支持哪个swift版本，一般来讲现在都是支持Swift3的，输入这段就好了
echo "3.0" > .swift-version
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