Merge pull request #540 from remlostime/ordered-array-swift

[Swift 4] Update Ordered Array

Author: kelvinlauKL

Ordered Array/OrderedArray.playground/Contents.swift

@@ -1,5 +1,10 @@
 //: Playground - noun: a place where people can play
 
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
 public struct OrderedArray<T: Comparable> {
   fileprivate var array = [T]()