Update README.md

Co-Authored-By: Leonardo Tegon <[email protected]>

Author: yeonhoyoon

Diff for: README.md

@@ -909,7 +909,7 @@ config.wrappers do |b|
 end
 ```
 
-This sets the input and label class to `'label-input-class'` and will set the class `'is-invalid'`
+This sets the input and label classes to `'label-input-class'` and will set the class `'is-invalid'`
 if the input has errors and `'is-valid'` if the input is valid.
 
 If you want to customize the custom _Form components_ on demand you can give it a name like this: