Rasterio

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- The CRS definition saved in RGB.byte.tif has been updated so that it is
identified as precisely EPSG:32618 by GDAL 3.2.1 (2083).
- Remove non-breaking hyphens accidentally added to README, open the file with
encoding="utf-8" when reading the description so that future UTF-8 chars
don't break package setup.

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- Search for PROJ data in the module before searching system locations (2080).

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- Emit a warning to the Python logger when a metadata item can't be decoded to
a Python unicode object (2078).
- Use language_level=3 Cython directive for all .pyx sources (2077).
- Deprecated usage of numpy.ndarray.tostring() has been changed to use
tobytes().

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- Remove compat module and future namespace imports (2067).
- A bug in construction of requester pays AWS sessions has been fixed (2062).
- Support for the "rms" resampling method in a future version of GDAL has been
added (2056).

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- Support for Azure Blob Storage using an "az" URI scheme has been added
(1906).
- Support for RPCs and coordinate transformations and raster warping with RPCs
has been added (1845, 1922, 2029, 2030, 2031).
- Add dst_path and dst_kwds parameters to rasterio's merge tool to allow
results to be written directly to a dataset (1867).
- Rasterio's merge tool can now accept Paths as input (2043).
- A bug in accessing public Alibaba Cloud data has been fixed (2018).
- In "w" mode the driver keyword argument of open() may be omitted, in which
case the driver will be determined by the file extension of the first
positional argument (2008).
- The transform_geom has been optimized for sequences of geometries (1827).

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- Multipolyons passed to rasterize are flattened to avoid holes in output
(2014).
- If the certifi package can be imported, its certificate store location will
be passed to GDAL during import of rasterio._env unless CURL_CA_BUNDLE is
already set (2009).