[1.7] Indicate when artifacts include experimental changes (#1117) (#1126)

Author: Mathieu Martin

CHANGELOG.md

@@ -19,7 +19,7 @@ All notable changes to this project will be documented in this file based on the
 * Added `threat.technique.subtechnique` to capture MITRE ATT&CK® subtechniques. #951
 * Added `configuration` as an allowed `event.category`. #963
 * Added a new directory with experimental artifacts, which includes all changes
-  from RFCs that have reached stage 2. #993, #1053, #1115, #1118
+  from RFCs that have reached stage 2. #993, #1053, #1115, #1117, #1118
 
 #### Improvements
 

experimental/generated/beats/fields.ecs.yml

@@ -1,5 +1,5 @@
 # WARNING! Do not edit this file directly, it was generated by the ECS project,
-# based on ECS version 1.7.0-dev.
+# based on ECS version 1.7.0-dev+exp.
 # Please visit https://github.com/elastic/ecs to suggest changes to ECS fields.
 
 - key: ecs