docs(readme): note about CI servers
docs(readme): note about CI servers

driftyco/ionic-cli,driftyco/ionic-cli,ricardo-mello/ionic-cli,driftyco/ionic-cli,devtotvs/thf-mobile-cli,devtotvs/thf-mobile-cli,ricardo-mello/ionic-cli,ricardo-mello/ionic-cli,devtotvs/thf-mobile-cli