Update screenshot in README

Author: atimmer

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Changed
+* Updated screenshot in README
 
 ## [1.0.0-beta.2] - 2017-03-11
 ### Added