code: function checkHeadsOnline(pattern, opts, callback) {
    var args = verify(pattern, opts, callback);
    var refs = 'refs/heads/' + cache.branch;
    request(refs, args.opts, args.callback);
  }
docs: Send request to the Github API for `refs/heads`.
  
  @name .branch
  @param  {String}   `pattern`
  @param  {Object}   `opts`
  @param  {Function} `callback`
  @api public