lazpy 0.9.2

Documentation only. The library is identical to 0.9.1.

• A LAZ-to-GeoTIFF worked example: rasterizing a point cloud to a 1-metre
  digital surface model and writing it with rasterio, with the reasoning
  the README had no room for.
• types.rst retitled to "Reader and Writer exchange types".

Tagged so the new page reaches the stable docs, which Read the Docs builds
from the greatest tag rather than from the default branch.

Docs: https://lazpy.readthedocs.io

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