run cargo fmt

tests/tester.rs

@@ -50,7 +50,8 @@ impl BatTester {
                 &format!("--wrap={}", if wrap { "character" } else { "never" }),
                 &format!("--tabs={}", tab_width),
                 &format!("--style={}", style),
-            ]).output()
+            ])
+            .output()
             .expect("bat failed");
 
         // have to do the replace because the filename in the header changes based on the current working directory