Add tip about deleting subdirectories (#116)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>
sindresorhus · Feb 24, 2020 · 4acd962 · 4acd962
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diff --git a/readme.md b/readme.md
@@ -72,6 +72,12 @@ You have to explicitly ignore the parent directories too:
 del.sync(['public/assets/**', '!public/assets', '!public/assets/goat.png']);
 ```
 
+To delete all subdirectories inside `public/`, you can do:
+
+```js
+del.sync(['public/*/']);
+```
+
 Suggestions on how to improve this welcome!