fixed readme screenshot
fixed readme screenshot

LessonPlanet/wraith,BBC-News/wraith,jzinkdi/wraith,saulirajala/wraith,peruukki/wraith,saulirajala/wraith,LessonPlanet/wraith,peruukki/wraith,BBC-News/wraith,LessonPlanet/wraith,peruukki/wraith,saulirajala/wraith,jzinkdi/wraith,jzinkdi/wraith,BBC-News/wraith