Fix the changelog version for breaking-change

Author: moxarth-rathod

packages/box_events/changelog.yml

@@ -1,5 +1,5 @@
 # newer versions go on top
-- version: "2.16.0"
+- version: "3.0.0"
   changes:
     - description: |
         Remove non-ECS fields that are collided with ECS namespace.

packages/box_events/manifest.yml

@@ -1,7 +1,7 @@
 format_version: "3.0.3"
 name: box_events
 title: Box Events
-version: "2.16.0"
+version: "3.0.0"
 description: "Collect logs from Box with Elastic Agent"
 type: integration
 categories: