chore(package): update xo to version 0.21.0

test/helpers/mockserver.js

@@ -12,8 +12,6 @@ let container;
 
 /**
  * Download the `mockserver` Docker image, create a new container and start it.
- *
- * @return {Promise} Promise that resolves when the container is started.
  */
 async function start() {
   await getStream(await docker.pull(IMAGE));
@@ -39,8 +37,6 @@ async function start() {
 
 /**
  * Stop and remote the `mockserver` Docker container.
- *
- * @return {Promise} Promise that resolves when the container is stopped.
  */
 async function stop() {
   await container.stop();