CHANGELOG.md in open_api-0.4.0 vs CHANGELOG.md in open_api-0.5.0

@@ -1,6 +1,10 @@
 ## Unreleased
 
+
+## 0.5.0
+- Allow using with rails 6
+
 ## 0.3.4
 * Fix to use array object for "propaties" of Schema
 
 ## 0.3.3
 * Follow nil case of extra fields in Schema