Update min node version

Author: wooorm

.github/workflows/main.yml

@@ -17,5 +17,5 @@ jobs:
     strategy:
       matrix:
         node:
-          - lts/erbium
+          - lts/fermium
           - node

readme.md

@@ -55,7 +55,7 @@ It turns hast into HTML.
 ## Install
 
 This package is [ESM only][esm].
-In Node.js (version 12.20+, 14.14+, or 16.0+), install with [npm][]:
+In Node.js (version 14.14+, 16.0+, or 18.0+), install with [npm][]:
 
 ```sh
 npm install hast-util-from-html
@@ -400,7 +400,7 @@ It exports the additional type `Options`, `OnError`, `ErrorCode`, and
 
 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+, 16.0+, and 18.0+.
 Our projects sometimes work with older versions, but this is not guaranteed.
 
 ## Security