Add event fieldset under threat.indicator fieldset

rylnd · rylnd · commit fb057b087c6a · 2021-04-12T16:49:42.000-05:00
This is used to preserve the event fields of the original indicator
event in the case of said indicator enriching another event.
diff --git a/rfcs/text/0008/event.yml b/rfcs/text/0008/event.yml
@@ -0,0 +1,5 @@
+---
+- name: event
+  reusable:
+    expected:
+      - threat.indicator
