Update version and changelog for averaging HR

Author: ruvilonix

apps/recorder/ChangeLog

@@ -61,4 +61,6 @@
 0.47: Fix 'blip' on speed map on some recordings
       Ensure Battery voltage is only stored to 0.01v
       Add graphs for Steps+Battery
-0.48: Add ability to log average acceleration values
+0.48: Add ability to log average acceleration values
+0.49: Log average high confidence (>=80) HR reading for each interval, instead of logging the last 
+      reading. If none pass confidence threshold, fall back to highest low confidence reading.

apps/recorder/metadata.json

@@ -2,7 +2,7 @@
   "id": "recorder",
   "name": "Recorder",
   "shortName": "Recorder",
-  "version": "0.48",
+  "version": "0.49",
   "author": "bobrippling",
   "description": "Record GPS position, heart rate and more in the background, then download to your PC.",
   "icon": "app.png",