Update README.md

Author: mattpolzin

README.md

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 # JSONAPI+OpenAPI
-[![MIT license](http://img.shields.io/badge/license-MIT-lightgrey.svg)](http://opensource.org/licenses/MIT) [![Swift 5.1](http://img.shields.io/badge/Swift-5.1-blue.svg)](https://swift.org) [![Build Status](https://app.bitrise.io/app/2ae0b5578e1905b8/status.svg?token=T8UAUN08e1_GnYk1z3P98g&branch=master)](https://app.bitrise.io/app/2ae0b5578e1905b8)
+[![MIT license](http://img.shields.io/badge/license-MIT-lightgrey.svg)](http://opensource.org/licenses/MIT) [![Swift 5.1/5.2](http://img.shields.io/badge/Swift-5.1/5.2-blue.svg)](https://swift.org) [![Build Status](https://app.bitrise.io/app/2ae0b5578e1905b8/status.svg?token=T8UAUN08e1_GnYk1z3P98g&branch=master)](https://app.bitrise.io/app/2ae0b5578e1905b8)
 
 See parent project: https://github.com/mattpolzin/JSONAPI