Update index.html.js (graphql#566)

adds Grafoo to javascript graphql clients

Author: malbernaz

site/code/index.html.js

@@ -471,6 +471,7 @@ Executor.execute(schema, query) map println
   - [nanogql](https://github.com/yoshuawuyts/nanogql): Tiny GraphQL client library using template strings.
   - [gq-loader](https://github.com/Houfeng/gq-loader): A simple JavaScript GraphQL client，Let the *.gql file be used as a module through webpack loader.
   - [AWS Amplify](https://aws.github.io/aws-amplify): A JavaScript library for application development using cloud services, which supports GraphQL backend and React components for working with GraphQL data.
+  - [Grafoo](https://github.com/grafoojs/grafoo): An all purpose GraphQL client with view layer integrations for multiple frameworks in just 1.6kb.
 
 ### Swift / Objective-C iOS