0.10.2 release

[shoyer]

In the spirit of our goal for a more rapid release (#1821), let's aim to issue the 0.10.2 release in the next few days, ideally after the following PRs are merged (all of which are nearly ready):

• fix distributed writes fix distributed writes #1793
• einsum for xarray einsum for xarray #1968
• Support array_ufunc for xarray objects. Support __array_ufunc__ for xarray objects. #1962

CC @pydata/xarray

[shoyer]

all these are merged, now, so I'll probably issue the release on my commute home tonight.

[shoyer]

I tagged the release and uploaded to pypi. ReadTheDocs is currently building the docs and a pull request for updating conda-forge is up for review: conda-forge/xarray-feedstock#29

[jhamman]

Thanks @shoyer!