add changelog

Author: mtrezza

CHANGELOG.md

@@ -91,6 +91,7 @@ ___
 ### Breaking Changes
 - Improved schema caching through database real-time hooks. Reduces DB queries, decreases Parse Query execution time and fixes a potential schema memory leak. If multiple Parse Server instances connect to the same DB (for example behind a load balancer), set the [Parse Server Option](https://parseplatform.org/parse-server/api/master/ParseServerOptions.html) `databaseOptions.enableSchemaHooks: true` to enable this feature and keep the schema in sync across all instances. Failing to do so will cause a schema change to not propagate to other instances and re-syncing will only happen when these instances restart. The options `enableSingleSchemaCache` and `schemaCacheTTL` have been removed. To use this feature with MongoDB, a replica set cluster with [change stream](https://docs.mongodb.com/manual/changeStreams/#availability) support is required. (Diamond Lewis, SebC) [#7214](https://github.com/parse-community/parse-server/issues/7214)
 - Added file upload restriction. File upload is now only allowed for authenticated users by default for improved security. To allow file upload also for Anonymous Users or Public, set the `fileUpload` parameter in the [Parse Server Options](https://parseplatform.org/parse-server/api/master/ParseServerOptions.html) (dblythy, Manuel Trezza) [#7071](https://github.com/parse-community/parse-server/pull/7071)
+- Removed [parse-server-simple-mailgun-adapter](https://github.com/parse-community/parse-server-simple-mailgun-adapter) dependency; to continue using the adapter it has to be explicitly installed (Manuel Trezza) [#7321](https://github.com/parse-community/parse-server/pull/7321)
 ### Notable Changes
 - Added Parse Server Security Check to report weak security settings (Manuel Trezza, dblythy) [#7247](https://github.com/parse-community/parse-server/issues/7247)
 - EXPERIMENTAL: Added new page router with placeholder rendering and localization of custom and feature pages such as password reset and email verification (Manuel Trezza) [#6891](https://github.com/parse-community/parse-server/issues/6891)