⬆️ Bump rasterio from 1.0.13 to 1.0.15

[dependabot-preview]

Bumps rasterio from 1.0.13 to 1.0.15.

Changelog

Sourced from rasterio's changelog.

1.0.15 (2019-01-27)

• Google cloud storage support was not in fact added in 1.0.14, but is
  present in 1.0.15.

1.0.14 (2019-01-22)

• The _CRS class has been refactored so that a WKT representation, rather than
  PROJ4 representation, is the canonical form. This resolves issues #1397 and
  #1587 specifically, and an entire category of issues discussed in
  https://rasterio.groups.io/g/dev/message/68.
• Native support for Google Cloud Storage using "gs://" URLs has been added
  (#1577).
• On entering a dataset context (DatasetBase.enter) a new anonymous GDAL
  environment is created if needed and is entered. This makes with rasterio.open(...) as dataset: roughly equivalent to with rasterio.open(...) as dataset, Env():. This helps prevent bugs when datasets
  are created and then used later or are used in different scopes.

Commits

• d94bc2f Update version and change log
• f1fc65b Add google cloud storage support (#1577)
• 99218cc Prevent rare segfault
• de28812 Skip enum34 on python 3.6
• 95354de Update change log, authors, and version
• 3717b12 Remove numpy from conda env
• f934c34 Change _CRS class to make WKT canonical (#1597)
• 96b4074 Simplify from_wkt implementation (#1589)
• 9a424e4 Add anonymous Env in DatasetBase.enter if needed (#1591)
• 147a3c8 Require build to pass with GDAL 2.4
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #90.