Add Cheddar to the list of GraphQL users (graphql#529)

Author: rosscooperman

site/users/index.html.js

@@ -601,6 +601,11 @@ var logos = [
     img: 'universe.png',
     link: 'https://www.universe.com'
   },
+  {
+    name: 'Cheddar',
+    img: 'cheddar.png',
+    link: 'https://cheddar.com'
+  },
   {
     name: 'UC Trends',
     img: 'uctrends.png',