chore: make improvements suggested by clippy

src/command/mod.rs

@@ -47,7 +47,7 @@ pub struct Router {
 }
 
 impl Router {
-    fn add_route<'s, 'a, Fut, Handler>(&'s mut self, name: &'a str, handler: Handler)
+    fn add_route<Fut, Handler>(&mut self, name: &str, handler: Handler)
     where
         Fut: Future<Output = Return> + Send + 'static,
         Handler: Fn(State, Interaction) -> Fut + 'static,
@@ -55,7 +55,7 @@ impl Router {
         self.add_route_already_boxed(name, box_handler(handler));
     }
 
-    fn add_route_already_boxed<'s, 'a>(&'s mut self, name: &'a str, boxed_handler: BoxedHandler) {
+    fn add_route_already_boxed(&mut self, name: &str, boxed_handler: BoxedHandler) {
         self.map.insert(name, boxed_handler);
     }