update documentation

docs/_sources/changelog.md.txt

@@ -1,5 +1,16 @@
 # Change log
 
+## Version 0.5.1 (unreleased)
+
+### Issues Closed
+
+#### New Features
+
+* [#5](https://github.com/SamR1/FitTrackee/issues/5) - Display a chart with average speed
+
+In this release 1 issue was closed.  
+
+
 ## Version 0.5.0 (2021/11/14)
 
 ### Issues Closed

docs/_sources/features.rst.txt

@@ -76,7 +76,13 @@ Workouts
 - Workout creation by uploading a gpx file (related data are stored in database with metric system). A workout can even be created without gpx (the user must enter date, time, duration and distance).
 - A workout with a gpx file can be displayed with map, weather (if the DarkSky API key is provided) and charts (speed and elevation). Segments can be displayed.
 - Workout edition and deletion. User can add a note.
-- User statistics
+- User statistics, by time period (week, month, year) and sport:
+    - total distance
+    - total duration
+    - total workouts
+    - total ascent  (**new in 0.5.0**)
+    - total descent  (**new in 0.5.0**)
+    - average speed  (**new in 0.5.1**)
 - User records by sports:
     - average speed
     - farest distance