make to_duration accept Int<Option<Duration>>

README.md

@@ -18,7 +18,7 @@ let mut toasts = Toasts::default();
 
 ```rust
 // somewhere within [egui::App::update]...
-toasts.info("Hello world!").set_duration(Duration::from_secs(5));
+toasts.info("Hello world!").set_duration(Some(Duration::from_secs(5)));
 // ...
 toasts.show(ctx);
 ```

src/lib.rs

@@ -29,7 +29,7 @@ const SUCCESS_COLOR: Color32 = Color32::from_rgb(140, 230, 140);
 ///
 /// # egui_notify::__run_test_ctx(|ctx| {
 /// let mut t = Toasts::default();
-/// t.info("Hello, World!").set_duration(Some(Duration::from_secs(5))).set_closable(true);
+/// t.info("Hello, World!").set_duration(Duration::from_secs(5)).set_closable(true);
 /// // More app code
 /// t.show(ctx);
 /// # });

src/toast.rs

@@ -205,8 +205,8 @@ impl Toast {
     }
 
     /// In what time should the toast expire? Set to `None` for no expiry.
-    pub fn set_duration(&mut self, duration: Option<Duration>) -> &mut Self {
-        if let Some(duration) = duration {
+    pub fn set_duration(&mut self, duration: impl Into<Option<Duration>>) -> &mut Self {
+        if let Some(duration) = duration.into() {
             let max_dur = duration_to_seconds_f32(duration);
             self.duration = Some((max_dur, max_dur));
         } else {