docs: function getBinaryUrl() {
    var site = getArgument('--sass-binary-site') ||
               process.env.SASS_BINARY_SITE  ||
               process.env.npm_config_sass_binary_site ||
               (pkg.nodeSassConfig && pkg.nodeSassConfig.binarySite) ||
               'https://github.com/sass/node-sass/releases/download';
  
    return [site, 'v' + pkg.version, getBinaryName()].join('/');
  }