Update CHANGELOG.md (#41)

Prepare Changelog for v0.3.1 release

Author: thunderboltsid

CHANGELOG.md

@@ -5,6 +5,8 @@ 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]
+
+## [0.3.1] - 2022-11-03
 ### Added
 - Add `AdditionalTrustBundle` property to the `NutanixPrismEndpoint` struct in environment/credential/types.go
 - Add `AdditionalTrustBundle` property to the `ManagementEndpoint` struct in environment/types/types/go