made snake oil certificate option optional

README.md

@@ -29,6 +29,9 @@ maps: {}
 # force all traffic on ssl, except letsencrypt challenges
 force_ssl: True
 
+# generate a self signed certificate as default ssl cert
+snakeoil_default: False
+
 # install php-fpm, setup a php-handler upstream and copy a php location snippet to include in configs
 # either "False", "True" or a dict *phpconfig*, see below for definition
 php: False