Log Message:
py-pandas: updated to 0.22.0

v0.22.0:

This is a major release from 0.21.1 and includes a single, API-breaking change. \ 
We recommend that all users upgrade to this version after carefully reading the \ 
release note.

The only changes are:
* The sum of an empty or all-NA Series is now 0
* The product of an empty or all-NA Series is now 1
* We’ve added a min_count parameter to .sum() and .prod() controlling the \ 
minimum number of valid values for the result to be valid. If fewer than \ 
min_count non-NA values are present, the result is NA. The default is 0. To \ 
return NaN, the 0.21 behavior, use min_count=1.