Add author credits to end of post

src/templates/post.js

@@ -1,6 +1,7 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 import { graphql } from 'gatsby'
+import { Link } from 'gatsby'
 import Helmet from 'react-helmet'
 
 import { Layout } from '../components/common'
@@ -40,6 +41,15 @@ const Post = ({ data, location }) => {
                                     className="content-body load-external-scripts"
                                     dangerouslySetInnerHTML={{ __html: post.html }}
                                 />
+                                <section className="content-footer">
+                                    <p>
+                                        Written by { post.authors.map((author, key) => ([
+                                        <Link to={`/author/${author.slug}`}>{ author.name }</Link>,
+                                            <span>{ key == post.authors.length-1 ? '' :
+                                                key == post.authors.length-2 ? ' and ' : ', ' }</span>
+                                    ]))}
+                                    </p>
+                                </section>
                             </section>
                         </article>
                     </div>