Explicitly remove label from first argument of RangeReplaceableCollec…

…tion-conformance function as per SE-0046.

Swift 3.0 conformance.

For more info: <https://github.com/apple/swift-evolution/blob/master/proposals/0046-first-label.md>

Source/ColorWrap.swift

@@ -216,7 +216,7 @@ extension Color.Wrap: RangeReplaceableCollection {
 		parameters.reserveCapacity(minimumCapacity)
 	}
 
-	public mutating func append(newElement: Element) {
+	public mutating func append(_ newElement: Element) {
 		parameters.append(newElement)
 	}