(edit: original failure was mistaken) Does anyone know off hand why [this](https://dev.azure.com/xarray/xarray/_build/results?buildId=798) is failing? ``` ResolvePackageNotFound: - pandas=0.19 - python=3.5.0 ``` Worst case we could drop it... https://github.com/pydata/xarray/issues/3293