CHANGELOG.md in sidekiq_publisher-1.6.3 vs CHANGELOG.md in sidekiq_publisher-1.6.4

@@ -1,6 +1,9 @@
 # sidekiq_publisher
 
+## v1.6.4
+- Expand sidekiq support to v5.0.x-v6.x.x.
+
 ## v1.6.3
 - Handle client middleware that returns false.
 
 ## v1.6.2
 - Gracefully respond to `INT` and `TERM` process signals.