Update CHANGELOG.md

CHANGELOG.md

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-## 2.2.0 (Unreleased)
+## 2.1.1 (Unreleased)
+
+**If you are using v2.1.0, please upgrade to this new version as soon as possible.**
+
+BUG FIXES:
+* `resource/compute_cluster`: Revert [GH-1432] switching `vsan_disk_group` back to `TypeList`. Switching from `TypeList` to `TypeSet` is a sore spot when it comes to what is considered a breaking change to provider configuration. Generally we accept that users may use list indices within their config. When this attribute switched to `TypeSet` this caused a breaking change for configurations doing that, as `TypeSet` is indexed by a hash value that Terraform calculates. Furthermore other code around type assertions was not changed and this attribute actually crashed the provider in `v2.1.0`, we will address the now re-opened [GH-1205] in `v3.0.0` of the provider.
 
 FEATURES:
 * `resource/virtual_machine`: Adds support to check the power state of the resource. ([#1407](https://github.com/terraform-providers/terraform-provider-vsphere/issues/1407))