Refactor wording in readme.md

Author: wooorm

Diff for: readme.md

@@ -43,7 +43,7 @@ sanitize HTML at a higher-level (easier) abstraction.
 ## Install
 
 This package is [ESM only][esm].
-In Node.js (version 12.20+, 14.14+, 16.0+, or 18.0+), install with [npm][]:
+In Node.js (version 14.14+, 16.0+), install with [npm][]:
 
 ```sh
 npm install hast-util-sanitize
@@ -333,7 +333,7 @@ It exports the additional type `Schema`.
 
 Projects maintained by the unified collective are compatible with all maintained
 versions of Node.js.
-As of now, that is Node.js 12.20+, 14.14+, 16.0+, and 18.0+.
+As of now, that is Node.js 14.14+ and 16.0+.
 Our projects sometimes work with older versions, but this is not guaranteed.
 
 ## Security