docs: Adjust changelog formatting

CHANGELOG.md

@@ -2,11 +2,14 @@
 
 ## [5.8.2](https://github.com/trallnag/prometheus-fastapi-instrumentator/compare/v5.8.1...v5.8.2) (2022-06-12)
 
-Refactored the middleware to an ASGI implementation. Thanks to @Kludex and @adriangb. #139.
+Refactored the middleware to an ASGI implementation
+([#139](https://github.com/trallnag/prometheus-fastapi-instrumentator/issues/139)).
+Thanks to @Kludex and @adriangb for the proposal and implementation.
 
 ## [5.8.1](https://github.com/trallnag/prometheus-fastapi-instrumentator/compare/v5.8.0...v5.8.1) (2022-05-03)
 
-
-### Bug Fixes
-
-* **deps:** regression too strict version requirements [#136](https://github.com/trallnag/prometheus-fastapi-instrumentator/issues/136) ([36bc045](https://github.com/trallnag/prometheus-fastapi-instrumentator/commit/36bc045c5eb247fa7a83c25cc161f95b5d4b314d)). Thanks to @graipher for raising the issue.
+Fixed a regression that made the required FastAPI version too strict for no
+reason
+([#136](https://github.com/trallnag/prometheus-fastapi-instrumentator/issues/136))
+([36bc045](https://github.com/trallnag/prometheus-fastapi-instrumentator/commit/36bc045c5eb247fa7a83c25cc161f95b5d4b314d)).
+Thanks to @graipher for raising this issue.