Rasterio

Bug fixes:

- A regression in GeoJSON source handling in rio-rasterize (1425) has been
fixed.
- Rasterization of linear rings (1431) is now supported.
- The input file handler of rio-rasterize has been changed so that it does not
reject GeoJSON files (1425).
- Linear rings have been added as acceptable input for rio-rasterize and other
commands and functions (1431).

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Bug fixes:

- The output of calculate_default_transform() can be fixed to output dimensions
as well as to output resolution (1409).
- In using rio-warp, the --src-bounds option can now override the bounds of the
source dataset when --dimensions is used (1419).
- Bounds of rotated rasters are now calculated correctly (1422).
- A band indexing bug in reproject() (1350) has been fixed (1424).

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Bug fixes:

- Bounding envelopes are densified at higher precision in transform_bounds to
fix 1411.
- Add LERC compression to enums.Compression (1412).
- The reproject() function now passes dst_alpha properly to _reproject(), which
unlocks materialization of warp destination alpha band masks (1417).
- The --dimensions and --src-bounds options of rio-warp can be used together
as expected (1418).

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There have been no changes since release candidate 5.

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- C source files are now generated using Cython 0.28.3, which gives us support
for Python 3.7 (1404, 1405).

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- An integer overflow when multiplying the warp memory limit (1401) has been
fixed.