Merge pull request #210 from getsentry/stable-release

Prepare changelog for stable release

Author: Jean85

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+...
+
+## 3.0.0 - 2019-05-10
  - Add the `sentry:test` command, to test if the Sentry SDK is functioning properly.
 
 ## 3.0.0-beta2 - 2019-03-22