Update pig-007.rst
Added withdrawal date
@@ -9,7 +9,7 @@ PIG 7 - Models
* Author: Axel Donath (editor), Christoph Deil & Regis Terrier
* Created: Dec 17th, 2018
* Accepted:
-* Status: withdrawn
+* Status: withdrawn: Oct 7, 2019
* Discussion: `GH_1971`_
