Changes

DEP: Python 3.7+ (issue #215)
DEP: xarray 0.17+ (needed for issue #282)
REF: Store grid_mapping in encoding instead of attrs (issue #282)
ENH: enable engine="rasterio" via xarray backend API (issue #197 pull #281)
ENH: Generate 2D coordinates for non-rectilinear sources (issue #290)
ENH: Add encoded kwarg to rio.write_nodata (discussions #313)
ENH: Added decode_times and decode_timedelta kwargs to rioxarray.open_rasterio (issue #316)
BUG: Use float32 for smaller dtypes when masking (discussions #302)
BUG: Return correct transform in rio.transform with non-rectilinear transform (discussions #280)
BUG: Update to handle WindowError in rasterio 1.2.2 (issue #286)
BUG: Don't generate x,y coords in rio methods if not previously there (pull #294)
BUG: Preserve original data type for writing to disk (issue #305)
BUG: handle lock=True in open_rasterio (issue #273)

Acknowledgements

A total of 4 people contributed patches to this release. People with a
"+" by their names contributed a patch for the first time.

Other contributions: