CHANGELOG.md in fluent-plugin-slack-0.6.4 vs CHANGELOG.md in fluent-plugin-slack-0.6.5

@@ -1,4 +1,10 @@
+## 0.6.5 (2017/05/20)
+
+Enhancements:
+
+* Avoid Encoding::UndefinedConversionError from ASCII-8BIT to UTF-8 on to_json by doing String#scrub! (thanks @yoheimuta)
+
 ## 0.6.4 (2016/07/07)
 
 Enhancements:
 
 * Add `as_user` option (thanks @yacchin1205)