graphiql support for subscriptions endpoint

[sibelius]

Can we do something like this: https://github.com/janie128/subscription-graphql/blob/master/server/index.js#L18-L21?

using koa-graphql?

[ronal2do]

• 1

[chentsulin]

It's reasonable. I will look into this later if no one take this.

[evseevnn-zzz]

Any update

[respinha]

Any update?

[Max-Starling]

Any update?

[prakasa-tkpd]

any update on this ?