lib/utils/downloadTemplateFromRepo.js/parseRepoURL
function parseRepoURL(inputUrl) {
  if (!inputUrl) {
    throw new ServerlessError('URL is required');
  }

  const url = URL.parse(inputUrl.replace(/\/$/, ''));

  // check if url parameter is a valid url
  if (!url.host) {
    throw new ServerlessError('The URL you passed is not a valid URL');
  }

  switch (url.hostname) {
    case 'github.com': {
      return parseGitHubURL(url);
    }
    case 'bitbucket.org': {
      return parseBitbucketURL(url);
    }
    case 'gitlab.com': {
      return parseGitlabURL(url);
    }
    default: {
      const msg =
        'The URL you passed is not one of the valid providers: "GitHub", "Bitbucket", or "GitLab".';
      throw new ServerlessError(msg);
    }
  }
}