fix: add back default

eslint-plugin-jsdoc automatically removes these.
Fair enough for 99% of cases,
but `unicorn/no-object-as-default-parameter`
_correctly_ points out that default objects need to be spread.
This adds back the jsdoc docs for this specific case.

Author: lishaduck

lib/fs-wrapper.js

@@ -46,10 +46,10 @@ function readJsonFileSync(file) {
  * Read a file using Promises.
  *
  * @param {Path} file
- * @param {fs.BaseEncodingOptions & { flag?: fs.OpenMode | undefined }} [options]
+ * @param {fs.BaseEncodingOptions & { flag?: fs.OpenMode | undefined }} [options={encoding: 'utf8'}]
  * @returns {Promise<string>}
  */
-async function readFile(file, options) {
+async function readFile(file, options = {}) {
   const data = await fsp.readFile(file, {encoding: 'utf8', ...options});
   return data.toString();
 }