ENH: update feather IO for pyarrow 0.17 / Feather V2
Upcoming pyarrow 0.17 release will include an upgraded feather format. 

This PRs updates pandas for that, more specifically ensures the new keywords can be passed through (the basics should keep working out of the box, since the public API did not change), and small update to the tests 
Hi,  is feather v2 now supported by pandas?  It seems tag 1.0.4 but I cannot find it in the release note,  thanks! 

the current to_feather() in pandas 1.0.5 seems does not support the compression that was introduced in feather V2 as well.

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.to_feather.html this is in 1.1 @noklam Feather V2 is already supported by pandas 1.0.4, as long as you have pyarrow>=0.17 installed. 
But only the default behaviour, so no additional keywords (that is what this PR is enabling: correctly passing through keywords such as `compression`) Thanks!  Got it.  Looking forward to release 1.1 😀