Rioxarray

-------
- BUG: Lazy load colormap through _manager.acquire() in merge (issue 479)

-------
- DEP: pin rasterio>=1.1.1 (pull 471)
- BUG: Corrected bounds and transform args to float (pull 475)

-------
- DEP: Drop Python 3.7 support (issue 451)
- ENH: Add GCPs reading and writing (issue 376)

------
- BUG: Force coordinates to be exactly the same in `rio.reproject_match` (issue 298)

------
- ENH: Allow additional kwargs to pass from reproject_match() -> reproject() (pull 436)

------
- DEP: Make scipy an optional dependency (issue 413)
- BUG: Return cached transform when axis data missing (pull 419)
- BUG: Fix negative indexes in `rio.isel_window` (issue 421)