Update README.md

MengTo · web-flow · commit d761f575b0bd · 2018-10-03T11:16:39.000-04:00
diff --git a/README.md b/README.md
@@ -1,5 +1,5 @@
 ## Updated for Swift 4
-Requires Xcode 9 and Swift 4.
+Requires Xcode 10 and Swift 4.2.
 
 ## Installation
 Drop in the Spring folder to your Xcode project (make sure to enable "Copy items if needed" and "Create groups").
