Merge pull request #594 from remlostime/longest-swift

[Swift 4] Update Longest Common Subsequence

Author: kelvinlauKL

Longest Common Subsequence/LongestCommonSubsequence.playground/Contents.swift

@@ -1,3 +1,8 @@
+// last checked with Xcode 9.0b4
+#if swift(>=4.0)
+print("Hello, Swift 4!")
+#endif
+
 extension String {
   public func longestCommonSubsequence(_ other: String) -> String {
 

Longest Common Subsequence/LongestCommonSubsequence.playground/contents.xcplayground

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <playground version='5.0' target-platform='ios'>
     <timeline fileName='timeline.xctimeline'/>
-</playground>
+</playground>