Fix requests version to 2.20 for readthedocs.(#549)

nadiaya · web-flow · commit 3db7807ef6ac · 2018-12-12T13:56:27.000-08:00
diff --git a/.rtd-environment.yml b/.rtd-environment.yml
@@ -6,3 +6,4 @@ dependencies:
     - python>=3
     - numpy
     - scipy
+    - requests==2.20
