Update README

Author: matteocontrini

README.md

@@ -31,3 +31,5 @@ Configure Caddy to use the PostgreSQL storage module. Example `Caddyfile`:
 ```
 
 The `dsn` parameter is a [PostgreSQL connection string](https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING), either as a key/value string or as a connection URI.
+
+The `sslmode` connection parameter defaults to `require`. We recommend setting a `statement_timeout` (e.g. `30s`) and other [basic parameters](https://brandur.org/fragments/postgres-parameters).