code: function removeVendorHelper() {
    if (this.options.zip && this.options.cleanupZipHelper) {
      if (this.serverless.service.package.individually) {
        return BbPromise.resolve(this.targetFuncs)
          .map(f => {
            if (!get(f, 'module')) {
              set(f, ['module'], '.');
            }
            return f;
          })
          .then(funcs => uniqBy(funcs, f => f.module))
          .map(f => {
            this.serverless.cli.log(
              `Removing Python requirements helper from ${f.module}...`
            );
            return fse.removeAsync(
              path.join(this.servicePath, f.module, 'unzip_requirements.py')
            );
          });
      } else {
        this.serverless.cli.log('Removing Python requirements helper...');
        return fse.removeAsync(
          path.join(this.servicePath, 'unzip_requirements.py')
        );
      }
    }
  }
docs: Remove the vendor helper from the current service tree.
  @return {Promise} the promise to remove the vendor helper.