Add maintenance note

sindresorhus · web-flow · commit 47b89a70b51a · 2023-10-18T16:53:37.000+07:00
diff --git a/readme.md b/readme.md
@@ -2,6 +2,8 @@
 
 > Copy files
 
+**IMPORTANT:** This package has a lot of problems and I unfortunately don't have time to fix them. I would recommend against using this package until these problems are resolved. Help welcome (see the issue tracker)!
+
 ## Why
 
 - Fast by using streams.
