older pandas for python 3.4

Author: sheppard

.travis.yml

@@ -29,7 +29,7 @@ matrix:
       name: "Python 3.4"
       env:
         - DJANGO="django==2.0.13"
-        - PANDAS="pandas==0.21.0"
+        - PANDAS="pandas==0.20.3"
     - python: "3.5"
       name: "Python 3.5"
       env: []