Adding GraphCMS logo (graphql#145)

* Added GraphCMS logo

* Added GraphCMS logo to index.html.js

Author: mlukaszczyk

site/users/index.html.js

@@ -201,6 +201,11 @@ var logos = [
     img: 'ovos.png',
     link: 'http://www.ovos.at'
   },
+  {
+    name: 'GraphCMS',
+    img: 'graphcms.png',
+    link: 'https://graphcms.com'
+  },
   // Adding your logo?
   // Add it to the /users/logos/ directory and then append an entry above this comment.
   //