add unreleased headers

Co-authored-by: Ignas Anikevicius <[email protected]>

Author: rickeylev

CHANGELOG.md

@@ -20,6 +20,20 @@ A brief description of the categories of changes:
 * Particular sub-systems are identified using parentheses, e.g. `(bzlmod)` or
   `(docs)`.
 
+## Unreleased
+
+### Changed
+- Nothing yet
+
+### Fixed
+- Nothing yet
+
+### Added
+- Nothing yet
+
+### Removed
+- Nothing yet
+
 ## [0.37.0] - 2024-10-18
 
 [x.x.x]: https://github.com/bazelbuild/rules_python/releases/tag/0.37.0