Fix devdeps (spacetelescope#367)

* Fix erfa issue

* Add weekly cron badge

README.md

@@ -1,6 +1,8 @@
 # Roman Attribute Dictionary
 
-[![CI](https://github.com/spacetelescope/rad/actions/workflows/ci.yml/badge.svg)](https://github.com/spacetelescope/rad/actions/workflows/ci.yml) [![Documentation Status](https://readthedocs.org/projects/rad/badge/?version=latest)](https://rad.readthedocs.io/en/latest/?badge=latest)
+[![CI](https://github.com/spacetelescope/rad/actions/workflows/ci.yml/badge.svg)](https://github.com/spacetelescope/rad/actions/workflows/ci.yml)
+[![Documentation Status](https://readthedocs.org/projects/rad/badge/?version=latest)](https://rad.readthedocs.io/en/latest/?badge=latest)
+[![Weekly CI](https://github.com/spacetelescope/rad/actions/workflows/ci_cron.yml/badge.svg)](https://github.com/spacetelescope/rad/actions/workflows/ci_cron.yml)
 [![Powered by STScI Badge](https://img.shields.io/badge/powered%20by-STScI-blue.svg?colorA=707170&colorB=3e8ddd&style=flat)](http://www.stsci.edu)
 
 

tox.ini

@@ -19,14 +19,15 @@ description =
     cov: with coverage
     xdist: using parallel processing
 set_env =
-    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/liberfa/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
 extras =
     test
 deps =
     xdist: pytest-xdist
     cov: pytest-cov
     devdeps: numpy>=0.0.dev0
     devdeps: astropy>=0.0.dev0
+    devdeps: pyerfa>=0.0.dev0
 commands =
     pip freeze
     pytest \