Merge branch 'wheels-description-optional-dep' into 'master'

add optional dependencies to PyPI description

See merge request !2164

wheel/setup.py.in

@@ -19,6 +19,17 @@ Installing LALSuite from the Python Package Index requires pip >= 19.3.
 To install, simply run::
 
     $ pip install lalsuite
+
+Optional dependencies, which can be installed as ``pip install lalsuite[option]``:
+
+* ``lalinference`` (pulls in
+  `gwdatafind <https://pypi.org/project/gwdatafind/>`
+   and `gwpy <https://pypi.org/project/gwpy/>`)
+* ``lalpulsar`` (pulls in
+  `solar_system_ephemerides <https://pypi.org/project/solar-system-ephemerides/>`
+  to provide ephemeris files which, until LALSuite 7.15, were still included in the main package)
+* ``test`` (pulls in
+  `pytest <https://pypi.org/project/pytest/>`)
 """
 
 import os