Added alternative for negative nth-child 🙌🏼

Author: AllThingsSmitty

README.md

@@ -112,6 +112,15 @@ li:nth-child(-n+3) {
 }
 ```
 
+Or, since you've already learned a little about [using `:not()`](#use-not-to-applyunapply-borders-on-navigation), try:
+
+```css
+/* select items 1 through 3 and display them */
+li:not(:nth-child(-n+3)) {
+  display: none;
+}
+```
+
 Well that was pretty easy.