Export subscription type to Federation SDL.

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 - Remove unnecessary Box from WebSocket messages.
+- Export subscription type to Federation SDL. (for [GraphGate](https://github.com/async-graphql/graphgate) 😁)
 
 ## [2.5.11] - 2021-03-07
 

src/registry/export_sdl.rs

@@ -116,12 +116,6 @@ impl Registry {
                     return;
                 }
 
-                if let Some(subscription_type) = &self.subscription_type {
-                    if name == subscription_type && federation {
-                        return;
-                    }
-                }
-
                 if description.is_some() {
                     writeln!(sdl, "\"\"\"\n{}\n\"\"\"", description.unwrap()).ok();
                 }