Add poptin (popt.in)

Hello, I kindly ask to add Poptin service (https://app.popt.in/), this is a service managed by Poptin LTD (https://www.poptin.com/) for generate popup, lead and signup forms.

Links to their privacy policy: https://www.poptin.com/privacy-policy/

GDPR: https://www.poptin.com/gdpr/

Thanks