Add external JS on the doc

README.md

@@ -58,6 +58,7 @@ tarteaucitron.init({
     "removeCredit": false, /* Remove credit link */
     "moreInfoLink": true, /* Show more info link */
     "useExternalCss": false, /* If false, the tarteaucitron.css file will be loaded */
+    "useExternalJs": false, /* If false, the tarteaucitron.services.js file will be loaded */
 
     //"cookieDomain": ".my-multisite-domaine.fr", /* Shared cookie for subdomain website */