Fix typo (#160)

src/notification/notification.vala

@@ -167,7 +167,7 @@ namespace SwayNotificationCenter {
             this.revealer.set_transition_duration (this.transition_time);
 
             this.carousel.set_animation_duration (this.transition_time);
-            // Changes the swipte direction depending on the notifications X position
+            // Changes the swipe direction depending on the notifications X position
             switch (ConfigModel.instance.positionX) {
                 case PositionX.LEFT:
                     this.carousel.reorder (event_box, 0);