Add iconSrc in readme

README.md

@@ -42,6 +42,7 @@ tarteaucitron.init({
     "cookieslist": false, /* Show the cookie list */
     
     "showIcon": true, /* Show cookie icon to manage cookies */
+    // "iconSrc": "", /* Optionnal: URL or base64 encoded image */
     "iconPosition": "BottomRight", /* Position of the icon between BottomRight, BottomLeft, TopRight and TopLeft */
 
     "adblocker": false, /* Show a Warning if an adblocker is detected */