fix README according to github flavored markdown
fix README according to github flavored markdown

felquis/vanilla-es6-jspm,felquis/vanilla-es6-jspm,felquis/vanilla-es6-jspm,Andersos/vanilla-es6-jspm,Andersos/vanilla-es6-jspm,topheman/vanilla-es6-jspm,topheman/vanilla-es6-jspm,Andersos/vanilla-es6-jspm,topheman/vanilla-es6-jspm