Add code/chapter like https://www.howtographql.com/graphql-js/9-subscriptions/ It [was added in graphql-ruby 1.7](https://github.com/rmosolgo/graphql-ruby/pull/672) released [September 18th](https://rubygems.org/gems/graphql/versions/1.7.0) This will make graphql-ruby code compatible with https://github.com/howtographql/react-apollo/blob/master
Add code/chapter like https://www.howtographql.com/graphql-js/9-subscriptions/
It was added in graphql-ruby 1.7 released September 18th
This will make graphql-ruby code compatible with https://github.com/howtographql/react-apollo/blob/master