refactor: replace SessionManager::new with Default derive

src/cord.rs

@@ -37,13 +37,14 @@ pub struct Cord {
 impl Cord {
     pub fn new(config: Config) -> crate::Result<Self> {
         let (tx, rx) = mpsc::channel::<Message>();
+        let session_manager = SessionManager::default();
         let rich_client = Arc::new(RichClient::connect(config.client_id)?);
         let server = PipeServer::new(&config.pipe_name, tx.clone());
         let logger = Logger::new(tx.clone(), LogLevel::Off);
 
         Ok(Self {
             config,
-            session_manager: SessionManager::new(),
+            session_manager,
             rich_client,
             pipe: server,
             tx,

src/session/mod.rs

@@ -71,19 +71,13 @@ impl<'a> std::ops::DerefMut for SessionRefMut<'a> {
     }
 }
 
+#[derive(Default)]
 pub struct SessionManager {
     sessions: RwLock<HashMap<u32, Session>>,
     default_config: Option<PluginConfig>,
 }
 
 impl SessionManager {
-    pub fn new() -> Self {
-        Self {
-            sessions: RwLock::new(HashMap::new()),
-            default_config: None,
-        }
-    }
-
     pub fn create_session(&self, id: u32) {
         let mut sessions = self.sessions.write().unwrap();
         let session = Session::new(id);