Packages/py colorspacious (#17623)

* typo error correction

* Adding recipe for `colorspacious` (a python package)

* Copyright year changed

* revert last commit on basic_usage.rst

* better with a good description

* fix according to failed test

* Update var/spack/repos/builtin/packages/py-colorspacious/package.py

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

* Update var/spack/repos/builtin/packages/py-colorspacious/package.py

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

var/spack/repos/builtin/packages/py-colorspacious/package.py

+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyColorspacious(PythonPackage):
+    """A powerful, accurate, and easy-to-use Python library for doing colorspace
+    conversions.
+    """
+
+    homepage = "https://github.com/njsmith/colorspacious"
+    url      = "https://pypi.io/packages/source/c/colorspacious/colorspacious-1.1.2.tar.gz"
+
+    version('1.1.2', sha256='5e9072e8cdca889dac445c35c9362a22ccf758e97b00b79ff0d5a7ba3e11b618')
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-numpy', type=('build', 'run'))