Add Carthage badge

README.md

@@ -3,8 +3,10 @@
 <p align="center">
 <img src="https://github.com/freak4pc/RxCombine/raw/master/Resources/logo.png" width="220">
 <br /><br />
-<a href="https://cocoapods.org/pods/RxCombine" target="_blank"><img src="https://img.shields.io/cocoapods/v/RxCombine.svg?1"></a>
-<a href="https://github.com/apple/swift-package-manager" target="_blank"><img src="https://img.shields.io/badge/Swift%20Package%20Manager-compatible-brightgreen.svg"></a><br />
+<a href="https://cocoapods.org/pods/RxCombine" target="_blank"><img src="https://img.shields.io/cocoapods/v/RxCombine.svg?1" alt="RxCombine supports CocoaPods"></a>
+<a href="https://github.com/apple/swift-package-manager" target="_blank"><img src="https://img.shields.io/badge/Swift%20Package%20Manager-compatible-brightgreen.svg" alt="RxCombine supports Swift Package Manager (SPM)"></a>
+<a href="https://github.com/Carthage/Carthage" target="_blank"><img src="https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat" alt="RxCombine supports Carthage"></a>
+<br />
 <img src="https://img.shields.io/badge/platforms-iOS%2013.0%20%7C%20macOS%2010.15%20%7C%20tvOS%2013.0%20%7C%20watchOS%206%20%7C%20Linux-333333.svg" />
 </p>