Update CHANGELOG.md

Author: DanielMSchmidt

CHANGELOG.md

@@ -23,6 +23,7 @@ Experiments are only enabled in alpha releases of Terraform CLI. The following f
 * The [language-level experiment](https://developer.hashicorp.com/terraform/language/settings#experimental-language-features) `unknown_instances` permits `count` and `for_each` arguments in `module`, `resource`, and `data` blocks to have unknown values.
 
     This is at an early stage and so currently setting these arguments to unknown values will only yield broken behavior, and so it's not yet useful to participate in this experiment. Future work will improve support for this new possibility, gradually making this experiment viable.
+* `terraform provider lock` accepts a new boolean option `-enable-plugin-cache`. If specified, and if a [global plugin cache](https://developer.hashicorp.com/terraform/cli/config/config-file#provider-plugin-cache) is configured Terraform will use the cache in the provider lock process.
 
 ## ENHANCEMENTS: