chore: module example code typo (#359)

missing comma of obj is in comments instead

Author: armchair-traveller

README.md

@@ -109,7 +109,7 @@ Import or require as usual:
 const netlifyIdentity = require('netlify-identity-widget');
 
 netlifyIdentity.init({
-  container: '#netlify-modal' // defaults to document.body,
+  container: '#netlify-modal', // defaults to document.body
   locale: 'en' // defaults to 'en'
 });