docs: update readme

.env.example

@@ -0,0 +1,8 @@
+POSTGRES_PASSWORD="secret"
+DATABASE_URL="postgresql://postgres:secret@localhost/pastes?sslmode=disable"
+PASTES_SSH_PORT="2222"
+PASTES_WEB_PORT="3000"
+PASTES_DOMAIN="pastes.test:3000"
+PASTES_EMAIL="me@pastey.com"
+PASTES_SUBDOMAINS=1
+PASTES_PROTOCOL="http"

README.md

@@ -23,6 +23,7 @@ export PASTES_SSH_PORT=2222
 export PASTES_WEB_PORT=3000
 export PASTES_DOMAIN="pastes.sh"
 export PASTES_EMAIL="hello@pastes.sh"
+export PASTES_PROTOCOL="http"
 ```
 
 I just use `direnv` which will load my `.env` file.