CHANGELOG.md in govuk_app_config-1.5.0 vs CHANGELOG.md in govuk_app_config-1.5.1

@@ -1,4 +1,9 @@
+# 1.5.1
+
+* Set the `Content-Type` of healthchecks to `application/json`.
+* Make the health check statuses symbols.
+
 # 1.5.0
 
 * Add healthcheck support.  See README.md for usage information.
 
 # 1.4.2