pywinrm: server_cert_validation 'ignore' no longer works in 0.3.0

The following no longer works against a self-signed certificate, has server_cert_validation changed?

from winrm.protocol import Protocol

p = Protocol(
    endpoint='https://somewindows:5986/wsman',
    transport='ntlm',
    username=r'\Admin',
    password='ThePassword1',
    server_cert_validation='ignore')
shell_id = p.open_shell()
command_id = p.run_command(shell_id, 'ipconfig', ['/all'])
std_out, std_err, status_code = p.get_command_output(shell_id, command_id)
print std_out
p.cleanup_command(shell_id, command_id)
p.close_shell(shell_id)

Traceback (most recent call last): File “winrmtest.py”, line 9, in <module> shell_id = p.open_shell() File “/usr/lib/python2.7/site-packages/winrm/protocol.py”, line 157, in open_shell res = self.send_message(xmltodict.unparse(req)) File “/usr/lib/python2.7/site-packages/winrm/protocol.py”, line 234, in send_message resp = self.transport.send_message(message) File “/usr/lib/python2.7/site-packages/winrm/transport.py”, line 256, in send_message response = self._send_message_request(prepared_request, message) File “/usr/lib/python2.7/site-packages/winrm/transport.py”, line 261, in _send_message_request response = self.session.send(prepared_request, timeout=self.read_timeout_sec) File “/usr/lib/python2.7/site-packages/requests/sessions.py”, line 618, in send r = adapter.send(request, **kwargs) File “/usr/lib/python2.7/site-packages/requests/adapters.py”, line 506, in send raise SSLError(e, request=request) requests.exceptions.SSLError: HTTPSConnectionPool(host=‘123.45.67.89’, port=5986): Max retries exceeded with url: /wsman (Caused by SSLError(SSLError(“bad handshake: Error([(‘SSL routines’, ‘tls_process_server_certificate’, ‘certificate verify failed’)],)”,),))

With:

pip show pywinrm
---
Metadata-Version: 2.0
Name: pywinrm
Version: 0.3.0
Summary: Python library for Windows Remote Management
Home-page: http://github.com/diyan/pywinrm/
Author: Alexey Diyan
Author-email: alexey.diyan@gmail.com
Installer: pip
License: MIT license
Location: /usr/lib/python2.7/site-packages
Requires: six, requests-ntlm, requests, xmltodict
Classifiers:
  Development Status :: 4 - Beta
  Environment :: Console
  Intended Audience :: Developers
  Intended Audience :: System Administrators
  Natural Language :: English
  License :: OSI Approved :: MIT License
  Programming Language :: Python
  Programming Language :: Python :: 2
  Programming Language :: Python :: 2.6
  Programming Language :: Python :: 2.7
  Programming Language :: Python :: 3
  Programming Language :: Python :: 3.3
  Programming Language :: Python :: 3.4
  Programming Language :: Python :: 3.5
  Programming Language :: Python :: 3.6
  Programming Language :: Python :: Implementation :: PyPy
  Topic :: Software Development :: Libraries :: Python Modules
  Topic :: System :: Clustering
  Topic :: System :: Distributed Computing
  Topic :: System :: Systems Administration

However this previous release does work

pip show pywinrm
---
Metadata-Version: 2.0
Name: pywinrm
Version: 0.2.2
Summary: Python library for Windows Remote Management
Home-page: http://github.com/diyan/pywinrm/
Author: Alexey Diyan
Author-email: alexey.diyan@gmail.com
Installer: pip
License: MIT license
Location: /usr/lib/python2.7/site-packages
Requires: six, requests-ntlm, requests, xmltodict
Classifiers:
  Development Status :: 4 - Beta
  Environment :: Console
  Intended Audience :: Developers
  Intended Audience :: System Administrators
  Natural Language :: English
  License :: OSI Approved :: MIT License
  Programming Language :: Python
  Programming Language :: Python :: 2
  Programming Language :: Python :: 2.6
  Programming Language :: Python :: 2.7
  Programming Language :: Python :: 3
  Programming Language :: Python :: 3.3
  Programming Language :: Python :: 3.4
  Programming Language :: Python :: 3.5
  Programming Language :: Python :: 3.6
  Programming Language :: Python :: Implementation :: PyPy
  Topic :: Software Development :: Libraries :: Python Modules
  Topic :: System :: Clustering
  Topic :: System :: Distributed Computing
  Topic :: System :: Systems Administration