test_clusters.py throws import error

[sjsrey]

ImportError while importing test module '/home/serge/Dropbox/g/geosnap/git/geosnap/geosnap/tests/test_clusters.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
geosnap/tests/test_clusters.py:1: in <module>
    from geosnap import Community, io
geosnap/__init__.py:33: in <module>
    from . import harmonize
geosnap/harmonize/__init__.py:1: in <module>
    from .harmonize import harmonize
geosnap/harmonize/harmonize.py:9: in <module>
    from tobler.area_weighted import _slow_area_interpolate
E   ImportError: cannot import name '_slow_area_interpolate' from 'tobler.area_weighted' (/home/serge/anaconda3/envs/geosnap/lib/python3.7/site-packages/tobler/area_weighted.py)

[knaaptime]

I cant replicate this. I think the issue is we need to pin tobler>=0.2.1