fresnel v0.9.0 release

[Joshua A. Anderson]

fresnel v0.9.0 is now available.

* conda-forge binary package:
https://anaconda.org/conda-forge/fresnel
* Docker/singularity images: https://glotzerlab-software.readthedocs.io
* Source tarball:
http://glotzerlab.engin.umich.edu/Downloads/fresnel/
* git repository: https://github.com/glotzerlab/fresnel
* Documentation: http://fresnel.readthedocs.io

Thank you to all who contributed. Please report issues and suggest
feature enhancements via the github repository
(https://github.com/glotzerlab/fresnel). Please request support through
this mailing list.

v0.9.0 (2019-04-30)
-------------------

* Added support for linearizing colors of shape (4,)
* Improve examples

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Joshua A. Anderson, Ph.D.
Research Area Specialist, Chemical Engineering, University of Michigan
http://www-personal.umich.edu/~joaander/