CHANGELOG.md in fluent-plugin-slack-0.5.3 vs CHANGELOG.md in fluent-plugin-slack-0.5.4

@@ -1,4 +1,10 @@
+## 0.5.4 (2015/03/31)
+
+Enhancements:
+
+* Support `mrkdwn` option
+
 ## 0.5.3 (2015/03/29)
 
 Enhancements:
 
 * Support `https_proxy` option