Remove xarray<=0.16.0 pin (just block 0.16.1)

[jthielen]

Not sure if it is better to get a quick fix to this posting here or on the conda-forge feedstock, but it would be great if it were possible to change the current xarray<=0.16.0 pin to just prohibit the problematic 0.16.1 release (since the issue causing the pin, #36, was resolved in xarray 0.16.2). Right now, this pin unfortunately means that xskillscore (which requires xarray>=0.16.1) and xesmf cannot be installed together. Thanks!

xref Unidata/pyaos-ams-2021#54

[ocefpaf]

Argh. I introduce that in fb739ab and forgot to update the conda-package :-(

[raphaeldussin]

@huard I've just merged a few fixes, can we release a version 0.5.1 and propagate to conda-forge to solve issue
conda-forge/xesmf-feedstock#12

[huard]

@raphaeldussin Sounds good. Could you update CHANGES.rst with the latest PR ?

[raphaeldussin]

@huard CHANGES.rst is up to date. can I let you bump the version?

[huard]

Done: https://github.com/pangeo-data/xESMF/releases/tag/v0.5.1