Update for release

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.15.0] - 2021-12-27
 ### Added
 - Add maximum precipitation adjustment service that applies a "ceiling" or "cap" to precipitation values above a user-defined threshold. (PR #164, @dgergel)