chore: migrate code to ESM (#73)

node_modules/semver/ranges/valid.js

@@ -1,11 +0,0 @@
-const Range = require('../classes/range')
-const validRange = (range, options) => {
-  try {
-    // Return '*' instead of '' so that truthiness works.
-    // This will throw if it's invalid anyway
-    return new Range(range, options).range || '*'
-  } catch (er) {
-    return null
-  }
-}
-module.exports = validRange