Update README.md

README.md

@@ -30,7 +30,7 @@ Session.send(request) { result in
 
 ## Requirements
 
-- Swift 5.0 or later
+- Swift 5.3 or later
 - iOS 9.0 or later
 - Mac OS 10.10 or later
 - watchOS 2.0 or later
@@ -40,6 +40,8 @@ If you use Swift 2.2 or 2.3, try [APIKit 2.0.5](https://github.com/ishkawa/APIKi
 
 If you use Swift 4.2 or before, try [APIKit 4.1.0](https://github.com/ishkawa/APIKit/tree/4.1.0).
 
+If you use Swift 5.2 or before, try [APIKit 5.3.0](https://github.com/ishkawa/APIKit/tree/5.3.0).
+
 ## Installation
 
 #### [Carthage](https://github.com/Carthage/Carthage)