Update whats-new for 0.16.2 (#4611)
Update whats-new for 0.16.2 (#4611)

* Update whats-new for 0.16.2

* Update whats-new.rst
markelg/xray,jhamman/xarray,pydata/xarray,markelg/xray,pydata/xarray,markelg/xray,jhamman/xarray,jhamman/xarray,pydata/xarray