code: function checkName(name, cb) {
    request(`https://registry.npmjs.org/${name}/latest`, {}, function(err, res, msg) {
      if (err) return cb(err);
  
      if (typeof msg === 'string' && msg === 'Package not found') {
        cb(null, false);
        return;
      }
  
      if (res && res.statusCode === 404) {
        return cb(null, false);
      }
  
      cb(null, true);
    });
  }
docs: Check if a name exists on npm.
  
  ```js
  checkName('foo', function(err, exists) {
  if (err) throw err;
  console.log(exists);
  });
  //=> true
  ```
  @param  {String} `name` Name of module to check.
  @param  {Function} `cb` Callback function