Update README.md

Add quotes to vendor publish provider argument

Author: cmrd-senya

README.md

@@ -20,7 +20,7 @@ This package adds a `confirmed_at` and `confirmation_code` field to your users t
 Publish the migration and the configuration file using 
 
 ```bash
-php artisan vendor:publish --provider=BeyondCode\EmailConfirmation\EmailConfirmationServiceProvider
+php artisan vendor:publish --provider="BeyondCode\EmailConfirmation\EmailConfirmationServiceProvider"
 ```
 
 And run the migrations: