Mercantile

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- A missing comma in the ``__all__`` list caused the neighbors and parent
method to drop out of the module documentation (135).

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- Copyright holder and date (Mapbox, 2021) have been updated.
- CLI help and documentation has been updated.

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There have been no changes since 1.2a1.

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Project infrastructure changes:

- Default GitHub branch is now "main".

Deprecations and future warnings:

- The Tile constructor in mercantile 2.0 will refuse to make tiles with X and Y
indexes outside of the range 0 <= value <= 2 ** zoom. It will also require
indexes to be integers.

New features:

- Add ``geojson_bounds`` to get the bounding box of a GeoJSON geometry,
feature, or collection (119).
- Add ``minmax`` to get minimum and maximum x and y tile coordinates.
- Add ``neighbors`` function and command to get adjacent tiles (118).

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- In some cases tile() could return a Tile with float x or y attributes (115).
This is a new bug in 1.1.5 and breaks some user code on Python 2.7 and is now
fixed.

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- A bug in ``simplify()`` has been fixed and the algorithm has been improved
(111).
- Implementation of ``tile()`` has been simplified and corrected (114).