Update CHANGELOG.md

Author: radeksimko

CHANGELOG.md

@@ -4,6 +4,7 @@ BUG FIXES:
 
  - terraform/rootmodule: Make walker async by default ([#196](https://github.com/hashicorp/terraform-ls/pull/196))
  - refactor: asynchronous loading of root module parts ([#219](https://github.com/hashicorp/terraform-ls/pull/219))
+ - Enable formatting for older Terraform versions (<0.12) ([#219](https://github.com/hashicorp/terraform-ls/pull/219))
  - Gate formatting capability on v0.7.7+ ([#220](https://github.com/hashicorp/terraform-ls/pull/220))
 
 ## 0.4.1 (3 July)