Update README.md

Author: pankajsoni19

README.md

@@ -1,6 +1,6 @@
 # BertSwift
 
-[![Swift 5](https://img.shields.io/badge/Swift-4-green.svg)](https://developer.apple.com/swift/)
+[![Swift 5.0](https://img.shields.io/badge/Swift-5.0-green.svg)](https://developer.apple.com/swift/)
 
 ## About