Added access token and device id persistance. Fixes #3

.gitignore

@@ -1,2 +1,2 @@
 /target
-config.yaml
+config.yaml*

src/matrix.rs

@@ -39,6 +39,11 @@ pub async fn get_clients(config: &mut Config) -> Vec<Client> {
                 }
             }
         }
+        // If client is logged in, update the config to persist the session
+        if let Some(session) = client.session().await {
+            conf.access_token = Some(session.access_token);
+            conf.device_id = Some(session.device_id.to_string());
+        }
         
         clients.push(client.clone());
     }