re-add urllib
get a dependency conflict otherwise
@@ -31,6 +31,7 @@ requirements:
- pandas >=0.19.2
- pyarrow 0.13 # as of 7/5/19: linux/circleci bugs on 0.14
- requests >=2.12.4
+ - urllib3 1.24 # required by requests
- ruamel.yaml <=0.15.70
- tqdm >=4.26.0
- xattr >=0.9.6 # [not win]
