CHANGELOG.md in logstash-output-loggly-4.0.0 vs CHANGELOG.md in logstash-output-loggly-5.0.0

@@ -1,4 +1,18 @@
+## 5.0.0
+  - This version introduces "breaking" changes for users who never copied/renamed
+    their `@timestamp` field to `timestamp`: their events will suddenly appear
+    in Loggly with a `timestamp` based on Logstash's value of `@timestamp`.
+    This would especially be noticed at times where processing is behind, and
+    events need to be "backfilled".
+    - The plugin now sets field `timestamp` so that Loggly will recognize the
+      correct timestamp.
+      - The event's timestamps will however not be touched at all if `timestamp`
+        is already set on the event or if `@timestamp` is missing.
+    - This version introduces attribute `convert_timestamp` (defaults to true), which
+      triggers the timestamp mingling.
+  - Now log a debug message with all of the plugin's configuration upon initialization.
+
 ## 4.0.0
   - The plugin now uses the Loggly bulk API.
   - If you need to modify event batch sizes and max delay between flushes,
     please adjust the Logstash settings `pipeline.batch.size` and
     `pipeline.batch.delay` respectively.