title: Gatsby GraphQL cannot query field "url" on type "File" of Strapi
body: <p>I'm making a blog with Gatsby front-end, Strapi back-end. I made a query in component with StaticQuery</p>
  <pre><code>query={graphql`
          query {
            allStrapiArticle {
              edges {
                node {
                  strapiId
                  title
                  category {
                    name
                  }
                  image {
                    url
                  }
                }
              }
            }
          }
        `}
  </code></pre>
  <p>All of field is work fine without <code>image{url}</code>. I got error: <code>error  Cannot query field &quot;url&quot; on type &quot;File&quot;  graphql/template-strings</code>. How can I fix it? Thanks!</p>