Update README.md

README.md

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 [![BCH compliance](https://bettercodehub.com/edge/badge/alexxxdev/fuel-comfy?branch=master)](https://bettercodehub.com/)  
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=alexxxdev_fuel-comfy&metric=alert_status)](https://sonarcloud.io/dashboard?id=alexxxdev_fuel-comfy)
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=alexxxdev_fuel-comfy&metric=coverage)](https://sonarcloud.io/dashboard?id=alexxxdev_fuel-comfy)  
-[![Kotlin](https://img.shields.io/badge/Kotlin-1.4.10-blue.svg)](https://kotlinlang.org)
+[![Kotlin](https://img.shields.io/badge/Kotlin-1.4.21-blue.svg)](https://kotlinlang.org)
 [![Fuel](https://img.shields.io/badge/Fuel-2.3.1-blue.svg)](https://github.com/kittinunf/fuel)
 
 More comfortable use of [Fuel](https://github.com/kittinunf/fuel) as in [Retrofit](https://square.github.io/retrofit/) or [Feign](https://github.com/OpenFeign/feign) for Kotlin/Android