add dernierToucan url

backend/routes/routesToucan.js

@@ -107,7 +107,9 @@ router.route("/delete/:id")
         });
 
 router.get('/dernierToucan', (req, res) => {
-    Toucan.find()
+    Toucan.find((req.query.before || req.query.after) ? {"date": optionsDate} : null)
+        .sort({date:-1})
+        .limit(1)
         .exec(function (err, toucan) {
             if (err) {res.send(err);} 
             else {