Rioxarray

- BUG: Ensure transform correct in rio.clip without coords (pull 165)
- BUG: Ensure the nodata value matches the dtype (pull 166)
- Raise deprecation exception in add_spatial_ref and add_xy_grid_meta (pull 168)

- Deprecate add_spatial_ref and fix warning for add_xy_grid_meta (pull 158)

- BUG: Fix assigning fill value in `rio.pad_box` (pull 140)
- ENH: Add `rio.write_transform` to store cache in GDAL location (issue 129 & 139)
- ENH: Use rasterio windows for `rio.clip_box` (issue 142)
- BUG: Add support for negative indexes in rio.isel_window (pull 145)
- BUG: Write transform based on window in rio.isel_window (pull 145)
- ENH: Add `rio.count`, `rio.slice_xy()`, `rio.bounds()`, `rio.resolution()`, `rio.transform_bounds()` to Dataset level
- ENH: Add `rio.write_coordinate_system()` (issue 147)
- ENH: Search CF coordinate metadata to find coordinates (issue 147)
- ENH: Default `rio.clip` to assume geometry has CRS of dataset (pull 150)
- ENH: Add `rio.grid_mapping` and `rio.write_grid_mapping` & preserve original grid mapping (pull 151)

Changes
========
- BUG: Remove unnecessary memory copies in reproject method (pull 136)
- BUG: Fix order of axis in `rio.isel_window` (pull 133)
- BUG: Allow clipping with disjoint geometries (issue 132)
- BUG: Remove automatically setting tiled=True for windowed writing (pull 134)
- ENH: Add `rio.pad_box` (pull 138)

Acknowledgements
===============

A total of 3 people contributed patches to this release. People with a
"+" by their names contributed a patch for the first time.

* David Brochart
* Joe Hamman +
* Alan D. Snow

Other Contributions:
* Justin Gruca - PR Reviews

- rio.reproject: change input kwarg dst_affine_width_height -> shape & transform (125)
- ENH: Use pyproj.CRS to read/write CF parameters (issue 124)

- ENH: Added optional `shape` argument to `rio.reproject` (pull 116)
- Fix ``RasterioDeprecationWarning`` (pull 117)
- BUG: Make rio.shape order same as rasterio dataset shape (height, width) (pull 121)
- Fix open_rasterio() for WarpedVRT with specified src_crs (pydata/xarray/pull/4104 & pull 120)
- BUG: Use internal reprojection as engine for resampling window in merge (pull 123)

Acknowledgements
===============
A total of 3 people contributed patches to this release. People with a
"+" by their names contributed a patch for the first time.

* David Brochart +
* Taher Chegini +
* Alan D. Snow

Other Contributions:
- Justin Gruca - PR Reviews