power: Only update power status once per minute.

src/widgets/power.rs

@@ -96,7 +96,7 @@ impl Widget for PowerSupply {
                     data.append_full_text(&status);
                 }
                 return Some(WidgetUpdate {
-                    refresh_interval: std::time::Duration::new(1, 0),
+                    refresh_interval: std::time::Duration::new(60, 0),
                     data: Some(data),
                 });
             }