Update README.md

README.md

@@ -2,6 +2,7 @@
 [![CI Status](http://img.shields.io/travis/kishikawakatsumi/KeychainAccess.svg)](https://travis-ci.org/kishikawakatsumi/KeychainAccess)
 [![codecov](https://codecov.io/gh/kishikawakatsumi/KeychainAccess/branch/master/graph/badge.svg)](https://codecov.io/gh/kishikawakatsumi/KeychainAccess)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+[![SPM supported](https://img.shields.io/badge/SPM-supported-DE5C43.svg?style=flat)](https://swift.org/package-manager)
 [![Version](https://img.shields.io/cocoapods/v/KeychainAccess.svg)](http://cocoadocs.org/docsets/KeychainAccess)
 [![Platform](https://img.shields.io/cocoapods/p/KeychainAccess.svg)](http://cocoadocs.org/docsets/KeychainAccess)