Revert version/notes

Signed-off-by: John Howard <john.howard@solo.io>

Author: howardjohn

CHANGELOG.md

@@ -4,13 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.26.0]
+## [Unrelreased]
 
 ### Added
 
 - Added native histogram support, including native-only histograms and
   histograms with both classic and native buckets.
-- Added Prometheus protobuf encoding for native histogram sparse buckets.
 
 ## [0.25.0]
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "prometheus-client"
-version = "0.26.0"
+version = "0.25.0"
 authors = ["Max Inden <mail@max-inden.de>"]
 edition = "2021"
 description = "Open Metrics client library allowing users to natively instrument applications."