update changelog

Author: zainq11

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## UNRELEASED
 ### Enhancements
 * Adds `post_apply` to list of possible `stages` for Run Tasks by @carolinaborim [#1307](https://github.com/hashicorp/terraform-provider-tfe/pull/1307)
+* `r/tfe_oauth_client`: Add Bitbucket Data Center support with the `bitbucket_data_center` option for `service_provider` by @zainq11 [#1303](https://github.com/hashicorp/terraform-provider-tfe/pull/1304)
 
 ### Features
 * `d/tfe_oauth_client`: Add `project_ids` attribute, by @Netra2104 [1148](https://github.com/hashicorp/terraform-provider-tfe/pull/1148)