Add minor refactorings (#754)

src/report.rs

@@ -9,10 +9,7 @@ pub enum StepResult {
 
 impl StepResult {
     pub fn failed(&self) -> bool {
-        match self {
-            StepResult::Success | StepResult::Ignored | StepResult::Skipped(_) => false,
-            StepResult::Failure => true,
-        }
+        matches!(self, StepResult::Failure)
     }
 }