Add codebeat badge (#14)

Author: JZDesign

README.md

@@ -1,5 +1,5 @@
 # HTTPEngine
-![Swift](https://github.com/JZDesign/HTTPEngine/workflows/Swift/badge.svg) ![PublishDocumentation](https://github.com/JZDesign/HTTPEngine/workflows/PublishDocumentation/badge.svg) [![Docs](https://img.shields.io/badge/Jazzy-Documentation-634fb3.svg?style=flat)](https://jzdesign.github.io/HTTPEngine/) [![SPM compatible](https://img.shields.io/badge/SPM-Compatible-e66f20.svg?style=flat)](https://github.com/apple/swift-package-manager) [![License](https://img.shields.io/badge/License-MIT-335577.svg?style=flat)](https://github.com/JZDesign/HTTPEngine/blob/master/LICENSE) 
+![Swift](https://github.com/JZDesign/HTTPEngine/workflows/Swift/badge.svg) ![PublishDocumentation](https://github.com/JZDesign/HTTPEngine/workflows/PublishDocumentation/badge.svg) [![Docs](https://img.shields.io/badge/Jazzy-Documentation-634fb3.svg?style=flat)](https://jzdesign.github.io/HTTPEngine/) [![SPM compatible](https://img.shields.io/badge/SPM-Compatible-e66f20.svg?style=flat)](https://github.com/apple/swift-package-manager) [![codebeat badge](https://codebeat.co/badges/839231b0-5d79-4115-af21-dacf4f38457f)](https://codebeat.co/projects/github-com-jzdesign-httpengine-master) [![License](https://img.shields.io/badge/License-MIT-335577.svg?style=flat)](https://github.com/JZDesign/HTTPEngine/blob/master/LICENSE) 
 
 A convenience wrapper around Swift's Combine and URLSession to make `URLRequests`