initial pass at switching to plugn

plugins/certs/commands

@@ -144,7 +144,7 @@ case "$1" in
     if [[ -d "$APP_SSL_PATH" ]]; then
       dokku_log_info1 "Removing SSL endpoint from $APP"
       rm -rf $APP_SSL_PATH
-      pluginhook post-domains-update $APP
+      plugn trigger post-domains-update $APP
     else
       dokku_log_info1 "An app-specific SSL endpoint is not defined"
     fi

plugins/certs/plugin.toml

@@ -0,0 +1,4 @@
+[plugin]
+description = "dokku core certificate management plugin"
+version = "0.4.0"
+[plugin.config]