chore: fix missing array bracket in readme

Author: TheAlexLichter

README.md

@@ -90,7 +90,7 @@ export default {
               'Open Sans:n3,n4',
               'Roboto:n3,n7'
           ],
-          urls:
+          urls: [
               // for each Google Fonts add url + options you want
               // here add font-display option
               'https://fonts.googleapis.com/css?family=Open+Sans:300,400&display=swap'