fixes label-less method parameter #979
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The following code samples all use `append(_:)` without the `value:` label and since Swift 3 (https://github.com/apple/swift-evolution/blob/master/proposals/0046-first-label.md) this has to be implemented with a preceding `_` in the function signature.
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The following code samples all use
append(_:)without thevalue:label and since Swift 3 (https://github.com/apple/swift-evolution/blob/master/proposals/0046-first-label.md) this has to be implemented with a preceding_in the function signature.Checklist
Description
This is an update to one of the source code samples.
Your README.md states compatibility with Swift4.2, so this change from Swift 3 is warranted, I hope.
Feel free to deny the PR if I should have overlooked something.