Merge pull request kodecocodes#752 from mmcbee1/master

[Swift 4.2] Update Stack

Author: kelvinlauKL

Stack/Stack.playground/Contents.swift

@@ -1,9 +1,3 @@
-
-// last checked with Xcode 9.0b4
-#if swift(>=4.0)
-print("Hello, Swift 4!")
-#endif
-
 /*
   Stack
 

Stack/Stack.playground/contents.xcplayground

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<playground version='5.0' target-platform='ios'>
+<playground version='5.0' target-platform='ios' last-migration='1000'>
     <timeline fileName='timeline.xctimeline'/>
 </playground>