Update README.md

RyanDaDeng · web-flow · commit c00314dfdde9 · 2019-01-26T14:43:57.000+11:00
diff --git a/README.md b/README.md
@@ -245,7 +245,7 @@ You can also set the background reCAPTCHA as hidden or visible(bottomright):
 
 ``` php
    ...
-  'background_badge_display' => true,
+  'background_badge_display' => true, // if false, the badge will be invisible.
    ...
 ```
   
