docs(badge): Update badges to flat style
docs(badge): Update badges to flat style

maratgaip/MusicApi,KunalKapadia/express-mongoose-es6-rest-api,KunalKapadia/express-mongoose-es6-rest-api,wen911119/my-node-api,ssmlee04/docker-user-module,ssmlee04/docker-user-module,sebasalvarado/dementia-hacks-api,kenzanboo/mail,rcaracaus/pa11y-api