Add changelog entry for #471 [ci skip]

Author: Lamassu Changelog Bot

Changelog.md

@@ -11,6 +11,7 @@ based on merged pull requests. Search GitHub issues and pull requests for smalle
 - fix: metrics were not registered correctly, this simplifies the setup [#439](https://github.com/entur/lamassu/pull/439)
 - Respond with status code 502 if configured feed not yet available [#432](https://github.com/entur/lamassu/pull/432)
 - Do not lowercase feed urls [#455](https://github.com/entur/lamassu/pull/455)
+- Switch to v3 as base model for entity mapping [#471](https://github.com/entur/lamassu/pull/471)
   [](AUTOMATIC_CHANGELOG_PLACEHOLDER_DO_NOT_REMOVE)
 
 ## 1.0.0