rename variables

src/pomodoro.rs

@@ -75,9 +75,9 @@ impl Pomodoro {
                 }
             }
 
-            let current_interval = self.next_interval();
-            self.remaining = current_interval.get_duration();
-            self.send_notification(current_interval.get_message())?;
+            let next_interval = self.next_interval();
+            self.remaining = next_interval.get_duration();
+            self.send_notification(next_interval.get_message())?;
         }
     }