AttributeError: модуль 'tox.config' не имеет атрибута 'parseini'

Я недавно получил

3.36s$ pip install coveralls tox-travis
0.31s$ tox
Matching undeclared envs is deprecated. Be sure all the envs that Tox should run are declared in the tox config.
Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.5.6/bin/tox", line 11, in <module>
    sys.exit(cmdline())
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/tox/session.py", line 41, in cmdline
    main(args)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/tox/session.py", line 46, in main
    config = prepare(args)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/tox/session.py", line 28, in prepare
    config = parseconfig(args)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/tox/config.py", line 233, in parseconfig
    pm.hook.tox_configure(config=config)  # post process config object
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/pluggy/hooks.py", line 258, in __call__
    return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec_opts.get('firstresult'),
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/pluggy/callers.py", line 201, in _multicall
    return outcome.get_result()
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/pluggy/callers.py", line 76, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/pluggy/callers.py", line 180, in _multicall
    res = hook_impl.function(*args)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/tox_travis/hooks.py", line 46, in tox_configure
    autogen_envconfigs(config, undeclared)
  File "/home/travis/virtualenv/python3.5.6/lib/python3.5/site-packages/tox_travis/envlist.py", line 48, in autogen_envconfigs
    make_envconfig = tox.config.parseini.make_envconfig
AttributeError: module 'tox.config' has no attribute 'parseini'
The command "tox" exited with 1.

для проекта mpu (travis link)

Странно, что он работает для Python 2.7 и Python 3.6 - так в чем проблема?