Update CHANGELOG.md

Author: radeksimko

CHANGELOG.md

@@ -9,6 +9,10 @@ ENHANCEMENTS:
  - cmd: Introduce version JSON output ([#386](https://github.com/hashicorp/terraform-ls/pull/386))
  - Utilize CPU better when loading modules ([#391](https://github.com/hashicorp/terraform-ls/pull/391))
 
+BUG FIXES:
+
+ - Fix miscalculated semantic tokens ([#390](https://github.com/hashicorp/terraform-ls/pull/390))
+
 ## 0.12.1 (12 January 2021)
 
 BUG FIXES: