add(331): dry run option to release notes

Author: Dev380

docs/whats_new/v331.md

@@ -6,6 +6,10 @@ Here's an overview of the key changes included in this release.
 
 PR: [#757](https://github.com/dotenv-linter/dotenv-linter/pull/757) ([@harryzcy](https://github.com/harryzcy))
 
+### 2. Add `--dry-run` option to the "fix" subcommand
+
+PR: [#772](https://github.com/dotenv-linter/dotenv-linter/pull/772) ([@Dev380](https://github.com/Dev380))
+
 These are all the key changes that are included in the new [v3.3.1](https://github.com/dotenv-linter/dotenv-linter/releases/tag/v3.2.0) release.<br/>
 Thanks to everyone who contributed 🙏