Update CHANGELOG.md

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [2.25.0] - 2015-08-02
+## [Unreleased][unreleased]
 
+## [2.25.0] - 2015-08-02
+### Changed
 Significant performance improvement for handling of apps with logging disabled.  Any apps with logging disabled will now have zero cpu/battery impact.
 
 If you like to use Netflix, YouTube, Spotify, or any other high-traffic app while NetworkLog is enabled, but don't want to drain your battery with logging, just disable logging for that app.
 
 ## [2.24.2] - 2015-07-31
+### Fixed
 Fix an issue introduced by previous update (Lollipop fix) that prevented logging from working on some earlier (Jelly Bean, etc) devices.
 
 ## [2.24.1] - 2015-07-27
+### Fixed
 Fix an issue that prevented logging on Lollipop devices.
 
 ## [2.24.0] - 2015-05-16
+### Changed
 - Show total sent/recv statistics for packets/bytes for each app in the Apps tab without needing to expand the app
 - History now loads from most recent logfile entry (no longer shows empty log if logging has been turned off for longer than the load-history time range)
+
+### Fixed
 - Support arm64 devices
 
 ## [2.23.0] - 2014-04-16
+### Fixed
 - Improve detection of root and handling of root commands
 - Improve sorting by traffic speed -- now sorts apps without current traffic by timestamp
 - Performance optimizations