Update readme to reflect required Node versions (#60)

Author: RunDevelopment

README.md

@@ -13,7 +13,7 @@ A regular expression parser for ECMAScript.
 $ npm install @eslint-community/regexpp
 ```
 
-- require Node@^12.0.0 || ^14.0.0 || ^16.0.0 || >=18.0.0.
+- require Node@^12.0.0 || ^14.0.0 || >=16.0.0.
 
 ## 📖 Usage