docs: function Router(opts) {
    if (!(this instanceof Router)) {
      return new Router(opts);
    }
  
    this.opts = opts || {};
    this.methods = this.opts.methods || [
      'HEAD',
      'OPTIONS',
      'GET',
      'PUT',
      'PATCH',
      'POST',
      'DELETE'
    ];
  
    this.params = {};
    this.stack = [];
    this.MATCHS = {};
  }