Ansible Kernel 0.8.0 did not work with Python3

[sky-joker]

Describe the bug

When Ansible Kernel 0.8.0 is running in Python 3, the following error occurred.
The same error does not occur in python2.

Traceback (most recent call last):
  File "/usr/lib64/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib64/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/jupyter/venv/lib64/python3.6/site-packages/ansible_kernel/__main__.py", line 6, in <module>
    IPKernelApp.launch_instance(kernel_class=AnsibleKernel)
  File "/home/jupyter/venv/lib64/python3.6/site-packages/traitlets/config/application.py", line 658, in launch_instance
    app.start()
  File "/home/jupyter/venv/lib64/python3.6/site-packages/ipykernel/kernelapp.py", line 483, in start
    self.kernel.start()
  File "/home/jupyter/venv/lib64/python3.6/site-packages/ipykernel/kernelbase.py", line 290, in start
    self._publish_status('starting')
  File "/home/jupyter/venv/lib64/python3.6/site-packages/ipykernel/kernelbase.py", line 327, in _publish_status
    ident=self._topic('status'),
  File "/home/jupyter/venv/lib64/python3.6/site-packages/jupyter_client/session.py", line 748, in send
    stream.send_multipart(to_send, copy=copy)
  File "/home/jupyter/venv/lib64/python3.6/site-packages/ansible_kernel/kernel.py", line 68, in send_multipart
    result = channel.send_multipart(msg, *args, **kwargs)
  File "/home/jupyter/venv/lib64/python3.6/site-packages/ansible_kernel/kernel.py", line 1173, in send_multipart
    if msg0.startswith("comm"):
TypeError: startswith first arg must be bytes or a tuple of bytes, not str

To Reproduce

$ python36 -m venv venv
$ source venv/bin/activate
$ pip3 install ansible
$ pip3 install jupyter
$ pip3 install ansible-kernel
$ python -m ansible_kernel.install
$ jupyter notebook

Screenshots

Desktop (please complete the following information):

• OS: CentOS Linux release 7.5.1804 (Core)
• Browser chrome
• Version 68.0.3440.106
• Jupyter 4.4.0
• Jupyter lab 0.34.4

Smartphone (please complete the following information):

Additional context

I fixed the bug as follows.

--- before/kernel.py    2018-08-29 02:06:43.781003421 +0900
+++ after/kernel.py 2018-08-29 02:06:37.782995367 +0900
@@ -1170,7 +1170,7 @@
             msg3_data = json.loads(msg3)
             msg6_data = json.loads(msg6)

-            if msg0.startswith("comm"):
+            if msg0.startswith(b"comm"):
                 _, _, comm_id = msg0.partition('-')
                 if msg3_data['msg_type'] == 'comm_open' and msg6_data['comm_id'] == comm_id:
                     self.update_widget(comm_id, msg6_data.get('data', {}).get('state', {}))

thanks.