improve documentation

src/config.rs

@@ -35,7 +35,8 @@ pub(crate) fn setup_clap() -> clap::ArgMatches<'static> {
         (author: crate_authors!())
         (about: crate_description!())
         (@arg config: +required "Set config file")
-        (@arg v: -v --verbose ... "Be verbose (you can add this up to 4 times for more logs)")
+        (@arg v: -v --verbose ... "Be verbose (you can add this up to 4 times for more logs).
+By default, only errors are logged, so no output is a good thing.")
     )
     .get_matches()
 }