code: function cleanupCache() {
    const cacheLocation = getUserCachePath(this.options);
    if (fse.existsSync(cacheLocation)) {
      if (this.serverless) {
        this.serverless.cli.log(`Removing static caches at: ${cacheLocation}`);
      }
  
      // Only remove cache folders that we added, just incase someone accidentally puts a weird
      // static cache location so we don't remove a bunch of personal stuff
      const promises = [];
      glob
        .sync([path.join(cacheLocation, '*slspyc/')], { mark: true, dot: false })
        .forEach(file => {
          promises.push(fse.removeAsync(file));
        });
      return BbPromise.all(promises);
    } else {
      if (this.serverless) {
        this.serverless.cli.log(`No static cache found`);
      }
      return BbPromise.resolve();
    }
  }
docs: Clean up static cache, remove all items in there
  @return {Promise}