chore: formatting adjustment

Author: NeedleInAJayStack

Sources/GraphQL/Subscription/Subscribe.swift

@@ -51,7 +51,6 @@ func subscribe(
     return sourceFuture.map { sourceResult -> SubscriptionResult in
         if let sourceStream = sourceResult.stream {
             let subscriptionStream = sourceStream.map { eventPayload -> Future<GraphQLResult> in
-
                 // For each payload yielded from a subscription, map it over the normal
                 // GraphQL `execute` function, with `payload` as the rootValue.
                 // This implements the "MapSourceToResponseEvent" algorithm described in