reconfig_job 'bytes' object has no attribute 'encode'

[Tivon]

Hi,
My python development environment:

Python-jenkins: 0.4.16
Python: 3.6.4

When i am using reconfig_job, i got a failure.(but i use python 2.7, it's ok. )

The error message:
WARNING 'bytes' object has no attribute 'encode'

This error occurred on ：

    def reconfig_job(self, name, config_xml):
        '''Change configuration of existing Jenkins job.

        To create a new job, see :meth:`Jenkins.create_job`.

        :param name: Name of Jenkins job, ``str``
        :param config_xml: New XML configuration, ``str``
        '''
        folder_url, short_name = self._get_job_folder(name)
        reconfig_url = self._build_url(CONFIG_JOB, locals())
        self.jenkins_open(Request(reconfig_url, config_xml.encode('utf-8'),
                                  DEFAULT_HEADERS))

When i delete "encode('utf-8')", it's ok.

However, I can't use pip to install Python-jenkins.