Add recent pull requests to changelog

Author: bailuk

CHANGELOG.md

@@ -4,3 +4,7 @@ See [metadata/en-US/changelogs](metadata/en-US/changelogs) for all changelogs.
 
 
 ## Next
+
+Android: Add "previous" button to cockpit view
+Lib: Use power meter data if available for calories description
+Lib: Flush GPX file after every log() call when tracking