Import problem with 'backends'

[mgbukov]

After installing paysage with pip in an Anaconda 3 environment, I get the following ImportError:

>>> import paysage
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mbukov/anaconda3/envs/DNN/lib/python3.6/site-packages/paysage/__init__.py", line 1, in <module>
    from . import backends
ImportError: cannot import name 'backends'

OS specifics:

• python: Anaconda 3.6

  Python 3.6.3 |Anaconda, Inc.| (default, Nov  8 2017, 18:10:31) 
  [GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
  Type "help", "copyright", "credits" or "license" for more information.

• OS: Mac OS X High Sierra