Revert "version < 2.0"
Revert "version < 2.0"

This reverts commit 564d37c0fdd7033be64b2ab1a10236f12024d194.

dietsche/letsencrypt,wteiken/letsencrypt,stweil/letsencrypt,dietsche/letsencrypt,jtl999/certbot,bsmr-misc-forks/letsencrypt,mitnk/letsencrypt,lmcro/letsencrypt,stweil/letsencrypt,mitnk/letsencrypt,DavidGarciaCat/letsencrypt,thanatos/lets-encrypt-preview,jtl999/certbot,letsencrypt/letsencrypt,thanatos/lets-encrypt-preview,brentdax/letsencrypt,wteiken/letsencrypt,lmcro/letsencrypt,DavidGarciaCat/letsencrypt,bsmr-misc-forks/letsencrypt,letsencrypt/letsencrypt,jsha/letsencrypt,brentdax/letsencrypt,jsha/letsencrypt