public function toMail($notifiable)
{
return (new MailMessage)
->subject('New Post Available')
->greeting('Hello, Subscriber')
->line('There is a new post. We hope you will like it.')
->line('Post Title : '.$this->post->title)
->action('View Post', url('post/{{$post->slug}}'))
->line('Thank you for using our application!');
}