esmlab.resample() error with xarray 0.15.1 about esmlab

[mnlevy1981]

Sorry, my fingers slipped and I managed to use keyboard shortcuts to hit "submit" before I was ready... but I updated the issue to finish including requested info.

I think the fix is to change line 200 in core.py to something like

        time = time.assign_coords(cftime.date2num(
            time, units=self.time_attrs['units'], calendar=self.time_attrs['calendar']
        ))

(The syntax may be off by a little bit, I've been using Dataset.assign_coords rather than DataArray.assign_coords to fix similar errors in my notebooks). I'll play with it tomorrow and report back.