Update index.js

Author: stefanfisk

index.js

@@ -232,10 +232,9 @@ function css(css, file) {
               chalk`{green Finished {bold ${relativePath}} in {bold ${prettyTime}}}`
             )
 
-            console.warn(reporter({
-              ...result,
+            console.warn(reporter(Object.assign({}, result, {
               messages: result.warnings(),
-            }));
+            })));
 
             return result
           })