Release version 3.1.15

Author: alfonsogarciacaro

CHANGELOG.md

@@ -6,6 +6,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## 3.1.15
+
+* Update Fable
+* Add sample: Undertone - Programmable music. @robertpi
+
 ## 3.1.12
 
 * Update Fable