just render minutes if queried by stop and line

src/departures-router.mjs

@@ -22,6 +22,14 @@ departuresRouter.get('/departures', (req, res) => {
       }));
     }
 
+    if (stop && line) {
+      const minutes = departures.flatMap((stop) => {
+        return stop.departures.flatMap((d) => d.next);
+      });
+
+      return res.json(minutes);
+    }
+
     return res.json(departures);
   } catch (error) {
     console.error('Error reading file:', error);