update how to cite xarray
update how to cite xarray

markelg/xray,shoyer/xarray,shoyer/xray,rabernat/xray,jhamman/xarray,xray/xray,markelg/xray,pydata/xarray,jhamman/xray,pydata/xarray,shoyer/xarray,chunweiyuan/xarray,rabernat/xray,jhamman/xarray,markelg/xray,pydata/xarray,jhamman/xarray,jcmgray/xarray