CHANGELOG.md in govuk_app_config-1.13.0 vs CHANGELOG.md in govuk_app_config-1.13.1

@@ -1,4 +1,9 @@
+# 1.13.1
+
+* Remove formating from the Logstasher logger, used by default for the
+  GDS API Adapters logging.
+
 # 1.13.0
 
 * Configure the GDS API Adapters logger to use logstasher
 * More consistent log level configuration by default