Update changelog for 0.28 upgrade

Author: BSteffaniak

opentelemetry-prometheus/CHANGELOG.md

@@ -2,16 +2,19 @@
 
 ## vNext
 
-- Bump msrv to 1.75.0.
+## v0.28.0
 
+- Update `opentelemetry` dependency version to 0.28
+- Update `opentelemetry_sdk` dependency version to 0.28
+- Update `opentelemetry-semantic-conventions` dependency version to 0.28
+- Bump msrv to 1.75.0.
 
 ## v0.27.0
 
 - Update `opentelemetry` dependency version to 0.27
 - Update `opentelemetry_sdk` dependency version to 0.27
 - Update `opentelemetry-semantic-conventions` dependency version to 0.27
 
-
 ## v0.17.0
 
 ### Changed
@@ -66,6 +69,7 @@
 ## v0.12.0
 
 ### Changed
+
 - [Breaking] Add `_total` suffix for all counters [#952](https://github.com/open-telemetry/opentelemetry-rust/pull/952).
 - Update to `opentelemetry` v0.19.
 - Bump MSRV to 1.57 [#953](https://github.com/open-telemetry/opentelemetry-rust/pull/953).