tweak readme layout
tweak readme layout

Esri/offline-editor-js,andygup/offline-editor-js,EnzeZY/offline-editor-js,andygup/offline-editor-js,andygup/offline-editor-js,Esri/offline-editor-js,Esri/offline-editor-js,EnzeZY/offline-editor-js,EnzeZY/offline-editor-js