fixed changelog heading format

Author: mtrezza

CHANGELOG.md

@@ -142,7 +142,7 @@ ___
 - Add ability to pass context of an object via a header, X-Parse-Cloud-Context, for Cloud Code triggers. The header addition allows client SDK's to add context without injecting _context in the body of JSON objects (Corey Baker) [#7437](https://github.com/parse-community/parse-server/pull/7437)
 
 ___
-### 4.5.1
+## 4.5.1
 [Full Changelog](https://github.com/parse-community/parse-server/compare/4.5.0...4.5.1)
 ### Security Fixes
 - SECURITY FIX: Fixes incorrect session property `authProvider: password` of anonymous users. When signing up an anonymous user, the session field `createdWith` indicates incorrectly that the session has been created using username and password with `authProvider: password`, instead of an anonymous sign-up with `authProvider: anonymous`. This fixes the issue by setting the correct `authProvider: anonymous` for future sign-ups of anonymous users. This fix does not fix incorrect `authProvider: password` for existing sessions of anonymous users. Consider this if your app logic depends on the `authProvider` field. (Corey Baker) [GHSA-23r4-5mxp-c7g5](https://github.com/parse-community/parse-server/security/advisories/GHSA-23r4-5mxp-c7g5)