code: function verify(token, sign, options) {
    return (done) => {
      jwt.verifySync(token, sign, options, done);
    };
  }
docs: Asynchronous verify the token.
  
  @example
  let result = yield jwt.verify(token, sign, options);
  
  @method
  @param {String} token
  @param {String} sign
  @param {Object} [options]
  @return {Function}