Fix typo

Author: alan412

src/reportWebVitals.ts

@@ -6,7 +6,8 @@ const reportWebVitals = (onPerfEntry?: (metric: any) => void) => {
       onFCP(onPerfEntry);
       onLCP(onPerfEntry);
       onTTFB(onPerfEntry);
-  });
-};
+    });
+  };
+}
 
 export default reportWebVitals;