Add _Default class
Add _Default class

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