Update to upstream version 0.3.0

Detailed maintainer log regarding breaking upstream changes:

• The config filename has been changed from "config.sh" to "config"
• The WELLKNOWN location has been changed upstream to "/var/www/letsencrypt" The port uses "%%PREFIX%%/www/letsencrypt" in accordance to hier(7).

PR: 212485
Submitted by: sascha@root-login.org (maintainer)