lib/plugins/aws/deployList/index.js/AwsDeployList/getFunctionVersions
class AwsDeployList:  getFunctionVersions(funcs) {
    const requestPromises = [];

    funcs.forEach((func) => {
      const params = {
        FunctionName: func.FunctionName,
        MaxItems: 5,
      };

      const request = this.provider.request('Lambda',
        'listVersionsByFunction',
        params,
        this.options.stage,
        this.options.region);

      requestPromises.push(request);
    });

    return BbPromise.all(requestPromises);
  }