MolVS 0.1.0 Standardization fails on Python 3 about molvs HOT 6 CLOSED

[  2:23pm ]  [ travis@mljet:~ ]
 $ pip install molvs==0.1.0
Collecting molvs==0.1.0
  Using cached MolVS-0.1.0-py3-none-any.whl
Requirement already satisfied: six in ./anaconda3/envs/rdkit/lib/python3.6/site-packages (from molvs==0.1.0)
Installing collected packages: molvs
  Found existing installation: MolVS 0.0.9
    Uninstalling MolVS-0.0.9:
      Successfully uninstalled MolVS-0.0.9
Successfully installed molvs-0.1.0
[  2:23pm ]  [ travis@mljet:~ ]
 $ python
Python 3.6.4 |Anaconda, Inc.| (default, Jan 16 2018, 18:10:19)
[GCC 7.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import molvs
>>> molvs.__version__
'0.1.0'
>>> exit()
[  2:23pm ]  [ travis@mljet:~ ]
 $ cat /home/travis/anaconda3/envs/rdkit/lib/python3.6/site-packages/molvs/normalize.py | grep "import six"
[  2:23pm ]  [ travis@mljet:~ ]
 $

[  2:23pm ]  [ travis@mljet:~ ]
 $ pip install -I --no-cache-dir molvs==0.1.0
Collecting molvs==0.1.0
  Downloading MolVS-0.1.0-py3-none-any.whl
Collecting six (from molvs==0.1.0)
  Downloading six-1.11.0-py2.py3-none-any.whl
Installing collected packages: six, molvs
Successfully installed molvs-0.1.0 six-1.11.0
[  2:26pm ]  [ travis@mljet:~ ]
 $ python
Python 3.6.4 |Anaconda, Inc.| (default, Jan 16 2018, 18:10:19)
[GCC 7.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import molvs
>>> molvs.__version__
'0.1.0'
>>> molvs.standardize_smiles('c1ccccc1')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/travis/anaconda3/envs/rdkit/lib/python3.6/site-packages/molvs/standardize.py", line 305, in standardize_smiles
    mol = Standardizer().standardize(mol)
  File "/home/travis/anaconda3/envs/rdkit/lib/python3.6/site-packages/molvs/standardize.py", line 98, in standardize
    mol = self.normalize(mol)
  File "/home/travis/anaconda3/envs/rdkit/lib/python3.6/site-packages/molvs/normalize.py", line 105, in __call__
    return self.normalize(mol)
  File "/home/travis/anaconda3/envs/rdkit/lib/python3.6/site-packages/molvs/normalize.py", line 124, in normalize
    fragments.append(self._normalize_fragment(fragment))
  File "/home/travis/anaconda3/envs/rdkit/lib/python3.6/site-packages/molvs/normalize.py", line 133, in _normalize_fragment
    for n in six.moves.range(self.max_restarts):
NameError: name 'six' is not defined