code: function getChoices() {
      return {
        lambdaIdentifiers: () => {
          return plugin.loadLambdas()
          .then(lambdas => {
            if (!lambdas.length) {
              icli.print(icli.format.error('This project does not contain any Lambda.'));
              process.exit(1);
            }
            return _.map(lambdas, lambda => {
              return {
                value: lambda.getIdentifier(),
                name: icli.format.info(lambda.getIdentifier())
              };
            });
          });
        }
      };
    }
docs: Build the choices for "list" and "checkbox" parameters
  @returns {Object} - collection of lists of choices for "list" and "checkbox" parameters