add comment for future refactorisation

src/Bundle/ChillMainBundle/Resources/public/vuejs/Address/api.js

@@ -22,6 +22,7 @@ const fetchCountries = () => {
 */
 const fetchCities = (country) => {
    //console.log('<<< fetching cities for', country);
+    // warning: do not use fetchResults (in apiMethods): we need only a **part** of the results in the db
    const url = `/api/1.0/main/postal-code.json?item_per_page=1000&country=${country.id}`;
    return fetch(url)
       .then(response => {