Update CHANGELOG.md

CHANGELOG.md

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 # Cloud Foundry HashiCorp Vault Broker Changelog
 
-## v0.1.0 (Unreleased)
+## v0.3.0 (January 23, 2019)
+
+FEATURES:
+- [#37](https://github.com/hashicorp/vault-service-broker/pull/37) adds support for all configuration variables to be provided through CredHub with UAA for CredHub authentication
+
+IMPROVEMENTS:
+- Adds functional tests documenting current behavior of the Vault Service Broker
+- Adds Travis CI builds
+
+BUG FIXES:
+- Resolves [#25](https://github.com/hashicorp/vault-service-broker/issues/25), an extraneous error renewing the Vault token on startup
+
+
+## v0.2.0 (July 24, 2017)
 
 - Initial Release
+- Implements the Bind, Unbind, Provision, and Deprovision calls for the Open Service Broker API