avoid python 3.8

conda_recipes/meta.yaml

@@ -14,11 +14,11 @@ build:
 requirements:
   build:
     - setuptools
-    - python >=3.6
+    - python >=3.6,<3.8
   host:
-    - python >=3.6
+    - python >=3.6,<3.8
   run:
-    - python >=3.6
+    - python >=3.6,<3.8
     - numpy
     - scipy
     - scikit-learn