pin Python 3.5 following hint in pybind/pybind11#667

molpopgen · molpopgen · commit c659f468e5e3 · 2017-03-07T09:47:15.000-08:00
diff --git a/docs/environment.yml b/docs/environment.yml
@@ -5,6 +5,7 @@ channels:
     - r
     - bioconda
 dependencies:
+    - python==3.5
     - gsl
     - pandas
     - numpy
