Revert this when conda 4.1 is stabilized

https://github.com/pydata/pandas/commit/8f3229227856af4feedb5894da9ccd4168a4e2a0
https://github.com/pydata/pandas/commit/eefe71e27131bc4848e549e3688ef6700b57b73a (partial revert)

fixing to 4.0.8

seems 4.1 breaks things.
