CHANGELOG.md in govuk_app_config-5.1.0 vs CHANGELOG.md in govuk_app_config-6.0.0

@@ -1,4 +1,9 @@
+## 6.0.0
+
+* BREAKING: Drop support for Ruby 2.7
+* Register the Prometheus exporter in Sinatra middleware
+
 # 5.1.0
 
 * Add support to force-load the GovukPrometheusExporter by setting `GOVUK_PROMETHEUS_EXPORTER` to `force`. ([#282](https://github.com/alphagov/govuk_app_config/pull/282))
 
 # 5.0.0