add changelog doc for bugfix

Author: isaisabel

CHANGELOG.md

@@ -1,3 +1,7 @@
+# V1.4.1 - 18 May 2020
+## Fixes
+- Fixed bug in LayerOps causing issues with cross-tactic techniques, as well as a bug where a score lambda could affect the outcome of other lambdas.
+
 # V1.4 - 5 May 2020
 ## New Scripts
 - Added Layers folder with utility scripts for working with [ATT&CK Navigator](https://github.com/mitre-attack/attack-navigator) Layers. See the Layers [README](layers/README.md) for more details. See issues [#2](https://github.com/mitre-attack/attack-scripts/issues/2) and [#3](https://github.com/mitre-attack/attack-scripts/issues/3).