new package: py-ics (#13576)

* new package: py-ics

* drop 0.5 and move to tar-ball

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

Co-Authored-By: Adam J. Stewart <ajstewart426@gmail.com>

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

Co-Authored-By: Adam J. Stewart <ajstewart426@gmail.com>

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

@@ -0,0 +1,39 @@
+# Copyright 2013-2019 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 PyIcs(PythonPackage):
+    """Ics.py : iCalendar for Humans
+
+    Ics.py is a pythonic and easy iCalendar library. Its goals are to
+    read and write ics data in a developer friendly way.
+
+    iCalendar is a widely-used and useful format but not user friendly.
+    Ics.py is there to give you the ability of creating and reading
+    this format without any knowledge of it.
+
+    It should be able to parse every calendar that respects the
+    rfc5545 and maybe some more. It also outputs rfc compliant
+    calendars.
+
+    iCalendar (file extension .ics) is used by Google Calendar, Apple
+    Calendar, Android and many more.
+
+    Ics.py is available for Python>=3.6 and is Apache2 Licensed.
+    """
+
+    homepage = "https://github.com/C4ptainCrunch/ics.py"
+    url      = "https://github.com/C4ptainCrunch/ics.py/archive/v0.6.tar.gz"
+
+    version('0.6', sha256='4947263136202d0489d4f5e5c7175dfd2db5d3508b8b003ddeaef96347f68830')
+
+    depends_on('python@3.6:', type=('build', 'run'))
+    depends_on('py-setuptools', type='build')
+    depends_on('py-python-dateutil', type=('build', 'run'))
+    depends_on('py-arrow@0.11:0.14.99', type=('build', 'run'))
+    depends_on('py-six@1.5:', type=('build', 'run'))
+    depends_on('py-tatsu@4.2:', type=('build', 'run'), when='@0.6:')