Add "test" disposition to doc

Author: kevcenteno

minfraud/models.py

@@ -418,8 +418,9 @@ class Disposition:
     .. attribute:: action
 
       The action to take on the transaction as defined by your custom rules.
-      The current set of values are "accept", "manual_review", and "reject".
-      If you do not have custom rules set up, ``None`` will be returned.
+      The current set of values are "accept", "manual_review", "reject", and
+      "test".  If you do not have custom rules set up, ``None`` will be
+      returned.
 
       :type: str | None