Remove failing Appveyor Python 2.7 32-bit build (#2617)
Remove failing Appveyor Python 2.7 32-bit build (#2617)

There seems to be some sort of dependency issue on Appveyor, but it's not
worth tracking down given how we'll be dropping Python 2.7 in the new year
anyways.
shoyer/xarray,shoyer/xray,chunweiyuan/xarray,markelg/xray,jhamman/xarray,markelg/xray,markelg/xray,shoyer/xarray,jhamman/xray,jhamman/xarray,jhamman/xarray,pydata/xarray,xray/xray,pydata/xarray,pydata/xarray