Update README.md

Author: Robert Gummesson

README.md

@@ -3,7 +3,7 @@ Build Time Analyzer for Xcode
 
 [![GitHub release](https://img.shields.io/github/release/RobertGummesson/BuildTimeAnalyzer-for-Xcode.svg)](https://github.com/RobertGummesson/BuildTimeAnalyzer-for-Xcode/releases/latest)
 [![Build Status](https://travis-ci.org/RobertGummesson/BuildTimeAnalyzer-for-Xcode.svg?branch=master)](https://travis-ci.org/RobertGummesson/BuildTimeAnalyzer-for-Xcode)
-[![Swift](https://img.shields.io/badge/Swift-3.0-orange.svg)](https://swift.org)
+[![Swift](https://img.shields.io/badge/Swift-4.0-orange.svg)](https://swift.org)
 [![Platform](https://img.shields.io/badge/platform-osx-blue.svg)](https://github.com/RobertGummesson/BuildTimeAnalyzer-for-Xcode)
 [![MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)