HISTORY.md in strong_actions-0.2.0 vs HISTORY.md in strong_actions-0.2.1

@@ -1,6 +1,9 @@
 # History
 
+## 0.2.1
+* drop support for rails-4.2, 5.0, 5.1（CVE-2020-8165）
+
 ## 0.2.0
 * drop support for ruby-2.3, 2.4
 
 ## 0.1.1
 * drop support for ruby-2.2