Officially deprecate

[ci skip]

README.rst

@@ -1,20 +1,20 @@
+Deprecation Warning
+===================
+
+This template is deprecated in favor of 
+`OpenAstronomy packaging guide <https://github.com/OpenAstronomy/packaging-guide>`__,
+which reflects more up-to-date Python packaging techniques. In 
+the future, this template will be replaced by a guide built from the OA guide specific
+to Astropy, but in the meantime, if you are starting a new project you may wish to
+start from the OA guide.
+
 Astropy package template
 ========================
 
 **cookiecutter branch:** |ci cookiecutter|
 
 |powered|
 
-Pending Deprecation Warning
----------------------------
-This template is in the process of being subsumed by the 
-`OpenAstronomy packaging guide <https://github.com/OpenAstronomy/packaging-guide>`__,
-which reflects more up-to-date Python packaging techniques than this template. In 
-the future this template may be replaced by a guide built from the OA guide specific
-to Astropy, but in the meantime, if you are starting a new project you may wish to
-start from the OA guide.
-
-
 Introduction
 ------------