Python 3.7 is throwing DeprecationWarning

[prsurve]

• virtual_env_3_7/lib64/python3.7/site-packages/pyipmi/msgs/message.py:371: DeprecationWarning: tostring() is deprecated. Use tobytes() instead.
  return data.tostring()

• virtual_env_3_7/lib64/python3.7/site-packages/pyipmi/interfaces/ipmitool.py:144: DeprecationWarning: fromstring() is deprecated. Use frombytes() instead.
  req_data.push_string(encode_message(req))

• virtual_env_3_7/lib64/python3.7/site-packages/pyipmi/interfaces/ipmitool.py:147: DeprecationWarning: tostring() is deprecated. Use tobytes() instead.
  req_data.tostring())

• virtual_env_3_7/lib64/python3.7/site-packages/pyipmi/msgs/message.py:367: DeprecationWarning: tostring() is deprecated. Use tobytes() instead.
  return data.tostring()