CHANGELOG.md in delayed_job_master-3.1.0 vs CHANGELOG.md in delayed_job_master-3.1.1

@@ -1,6 +1,10 @@
 # CHANGELOG
 
+## 3.1.1
+
+* Add `frozen_string_literal: true`.
+
 ## 3.1.0
 
 * Add timer feature.
 
 ## 3.0.1