add transactional in hooks list

rajumsys · rajumsys · commit 853b46a3a0b2 · 2016-10-14T09:50:57.000-04:00
diff --git a/docs/hooks.md b/docs/hooks.md
@@ -27,3 +27,4 @@ Hook names are prefixed with `wpsp_`.
 | wpsp_reply_to                | Filter   |
 | wpsp_body_headers            | Filter   |   
 | wpsp_smtp_msys_api           | Filter   |
+| wpsp_transactional           | Filter   | Set whether an email is transactional or not. 
