chore: rename stream.rs -> subscription.rs (#136)

Author: obmarg

.gitignore

@@ -21,4 +21,4 @@
 /.history/
 
 # Converage
-/coverage/
+/coverage/

src/client/mod.rs

@@ -21,14 +21,14 @@ mod conection_id;
 mod connection;
 mod keepalive;
 mod production_future;
-mod stream;
+mod subscription;
 
 pub use self::{
     actor::ConnectionActor,
     builder::ClientBuilder,
     conection_id::SubscriptionId,
     connection::{Connection, Message},
-    stream::Subscription,
+    subscription::Subscription,
 };
 
 /// A GraphQL over Websocket client