Retroactively update changelog

Author: amotl

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## development
 
+- Add Makefile to assist in packaging and publishing
+- Overlay image can now be refreshed with the dashboard. Thanks, @jreyesr!
+- Revert "Support multiple metrics in popup content for Elasticsearch" again.
+  The feature was not ready to be used with PostgreSQL and InfluxDB datasources yet.
+  Thanks, @matschaffer!
+
 ## v0.15.0
 - Support multiple metrics in popup content for Elasticsearch. Thanks, @matschaffer!