Merge pull request graphql#729 from andrey1s/php-railt

add Railt to PHP implies

Author: caniszczyk

site/code/index.html.js

@@ -341,6 +341,7 @@ Apollo Server also supports all Node.js HTTP server frameworks: Express, Connect
 
   - [graphql-php](https://github.com/webonyx/graphql-php): A PHP port of GraphQL reference implementation
   - [graphql-relay-php](https://github.com/ivome/graphql-relay-php): A library to help construct a graphql-php server supporting react-relay.
+  - [Railt](https://github.com/railt/railt): A PHP GraphQL Framework.
   - [Lighthouse](https://github.com/nuwave/lighthouse): A GraphQL server for Laravel
   - [GraphQLBundle](https://github.com/overblog/GraphQLBundle): A GraphQL server for Symfony