Changelog update. [ci skip]

Author: 23Skidoo

CHANGES.md

@@ -1,7 +1,7 @@
 ## 0.1.1.5 (2018-11-19)
 
  * GHC 8.6 support ([#28](https://github.com/tibbe/ekg-core/pull/28)).
- * Don't combine distribution if count == 0 ([#25](https://github.com/tibbe/ekg-core/pull/25)).
+ * Bugfix: avoid division by zero ([#25](https://github.com/tibbe/ekg-core/pull/25)).
 
 ## 0.1.1.4 (2018-02-27)