Added demo app section
Added demo app section

zedalaye/devise_mailjet,parterburn/devise_mailchimp,parterburn/devise_mailchimp,parterburn/devise_mailchimp,metalabs/devise_mailchimp,metalabs/devise_mailchimp,jcnnghm/devise_mailchimp,jcnnghm/devise_mailchimp,zedalaye/devise_mailjet