Update CHANGELOG.md

Author: faroceann

Diff for: CHANGELOG.md

@@ -5,7 +5,14 @@ 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]
+## [5.1.0] - 2020-07-09
+### Added
+- Add support for three guardian/MFA-related features:
+  - Guardian Policies
+  - Guardian Phone factor selected provider
+  - Guardian Phone factor message types
+- Adds support for Migrations 
+
 
 ## [5.0.0] - 2020-06-04
 ### Changed