improve changelog template
@@ -19,13 +19,16 @@ It should look like:
## [Unreleased]
### Added
-- Implement ... (#35)
+- Add a notable feature for users (#35)
### Changed
-- Fix a bug in ... (#33)
+- Change a behavior affecting users (#33)
### Removed
-- Deprecated `-option` is removed ... (#39)
+- Remove a feature, users action required (#39)
+
+### Fixed
+- Fix something not affecting users or a minor change (#40)
### Contributors
- @hoge
