docs: updated changelog for numToKeep fix

Gareth Jones · Gareth Jones · commit 9c1f516eec2d · 2019-10-08T09:59:13.000+11:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Streamroller Changelog
 
+## 2.2.1
+
+- Fix for num to keep not working when date pattern is all digits
+
 ## 2.2.0
 
 - [Fallback to copy and truncate when file is busy](https://github.com/log4js-node/streamroller/pull/53)
