style: format suggest method for improved readability

src/trial.rs

@@ -60,7 +60,11 @@ impl SuggestableRange for Range<i64> {
 
     fn suggest(self, trial: &mut Trial, name: String) -> Result<i64> {
         // Range is exclusive on the end, so subtract 1
-        trial.suggest_int(name, self.start, self.end.checked_sub(1).unwrap_or(self.end))
+        trial.suggest_int(
+            name,
+            self.start,
+            self.end.checked_sub(1).unwrap_or(self.end),
+        )
     }
 }