This plugin returns the content of medium posts.
Available properties are:
- title
 - date
 - author
 - link
 - content
 - thumbnail
 - slug
 
- Run 
npm i -S gatsby-source-medium-feed - Add plugin to your 
gatsby-config.js: 
plugins: [
  {
    resolve: 'gatsby-source-medium-feed',
    options: {
      userName: '@...', // Medium user name
      name: 'MediumFeed', // GraphQL query AllMediumFeed
    },
  },
]