v0.18.0 release highlights (#5266)
v0.18.0 release highlights (#5266)

Co-authored-by: keewis <39a065c0f814f810a499b803da99b94c24527abc@users.noreply.github.com>
markelg/xray,jhamman/xarray,pydata/xarray,pydata/xarray,markelg/xray,jhamman/xarray,jhamman/xarray,markelg/xray,pydata/xarray