Update README w/ SSL docs
Update README w/ SSL docs

krknopp/docker-nginx-proxy,diginikkari/nginx-proxy,browny/nginx-proxy,armhf-docker-library/nginx-proxy-old,deruhu/nginx-proxy,thomasleveil/nginx-proxy,flareair/docker_nginx_proxy,MashupMill/nginx-proxy,ynnadrules/nginx-proxy,randombk/nginx-proxy,rschmukler/nginx-proxy,petrblaho/nginx-proxy,tpcwang/nginx-proxy,remh/nginx-proxy,pocket-playlab/nginx-proxy,appropriate/nginx-proxy,krknopp/docker-nginx-proxy,adamsimp/nginx-proxy,kamermans/nginx-proxy,theosp/nginx-proxy,BenHall/nginx-proxy,dmp1ce/nginx-proxy-letsencrypt-circleci,raywalker-it/nginx-proxy,dylangmiles/nginx-proxy,itsafire/nginx-proxy,jacoelho/nginx-proxy,wartron/nginx-proxy,darrint/nginx-proxy,palamccc/nginx-proxy,NicolasTr/nginx-proxy,fonai/nginx-proxy,bing6/nginx-proxy,dmp1ce/nginx-proxy-circleci,dariuszz123/nginx-proxy-letsencrypt,RnbWd/nginx-proxy,funkygibbing/nginx-proxy,petecoop/nginx-proxy,jdivy/nginx-proxy,16nsk/nginx-proxy,thomasleveil/nginx-proxy,JrCs/docker-nginx-proxy-letsencrypt,byrnedo/nginx-proxy,jwilder/nginx-proxy,adi90x/rancher-active-proxy,kamermans/nginx-proxy,schmunk42/nginx-proxy,pocket-playlab/nginx-proxy,raumzeitlabor/nginx-proxy,dylangmiles/nginx-proxy,dougmarcey/nginx-proxy,itsafire/nginx-proxy,dockito/proxy,jwilder/nginx-proxy,kcyeu/nginx-proxy,adi90x/rancher-active-proxy,vovkasm/nginx-proxy,krknopp/docker-nginx-proxy,wartron/nginx-proxy