Update README.md

Author: satishVekariya

README.md

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 # SwiftEventBus
+[![Language](https://img.shields.io/badge/Swift-5.0-orange.svg?style=flat)](http://cocoapods.org/pods/SwiftEventBus)
+[![Language](https://img.shields.io/badge/Swift-4.2-orange.svg?style=flat)](http://cocoapods.org/pods/SwiftEventBus)
+[![Language](https://img.shields.io/badge/Swift-3.0-orange.svg?style=flat)](http://cocoapods.org/pods/SwiftEventBus)
+[![Language](https://img.shields.io/badge/Swift-2.2-orange.svg?style=flat)](http://cocoapods.org/pods/SwiftEventBus)
 
 Allows publish-subscribe-style communication between components without requiring the components to explicitly be aware of each other