chore v0.9.0 changelog (#444)

Author: leofigy

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## [v0.9.0](https://github.com/mongodb/terraform-provider-mongodbatlas/tree/v0.9.0) (2021-04-22)
+[Full Changelog](https://github.com/mongodb/terraform-provider-mongodbatlas/compare/v0.9.0-pre.1...v0.9.0)
+
+**Merged pull requests:**
+
+- Remove IOPS and adjust parameter description [\#443](https://github.com/mongodb/terraform-provider-mongodbatlas/pull/443) ([themantissa](https://github.com/themantissa))
+- remove unnecessary variables and use roles instead of keys for AWS Encryption-AtRest [\#441](https://github.com/mongodb/terraform-provider-mongodbatlas/pull/441) ([nikhil-mongo](https://github.com/nikhil-mongo))
+
 ## [v0.9.0-pre.1](https://github.com/mongodb/terraform-provider-mongodbatlas/tree/v0.9.0-pre.1)
 
 [Full Changelog](https://github.com/mongodb/terraform-provider-mongodbatlas/compare/v0.8.2...v0.9.0-pre.1)