build!: upgrade to Node.js 20 (#19)

* deps: bump them all

* build: upgrade Node.js 20

* chore: add engine requirement

Author: Alex Plischke

.eslintrc.js

@@ -7,6 +7,7 @@ module.exports = {
   },
   root: true,
   ignorePatterns: [
+    "/lib",
     "/tests",
     "/src/**/*.js"
   ],