xarray 0.8 includes support for [decorators](http://xarray.pydata.org/en/v0.8.2/internals.html#extending-xarray), preferred over subclasses of `xr.Dataset`. Convert py-gdx from a subclass to a decorator. This is a major change, and so will be backwards-incompatible.
xarray 0.8 includes support for decorators, preferred over subclasses of
xr.Dataset. Convert py-gdx from a subclass to a decorator.This is a major change, and so will be backwards-incompatible.