add cadence/power/heartRate to Point

we're not using it for anything yet, just parsing it

frontend/src/Main.elm

@@ -43,7 +43,7 @@ type alias TileNumber = { x: Int, y: Int }
 type alias Lat = Float
 type alias Lng = Float
 
--- project latling to co-ordinates based on pseudocode at
+-- project lat/long to co-ordinates based on pseudocode at
 -- https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#Zoom_levels
 
 sec x = 1 / (cos x)
@@ -140,6 +140,9 @@ type alias Pos =
 type alias Point =
     { time : Float
     , pos : Pos
+    , cadence : Maybe Int
+    , power : Maybe Int
+    , heartRate : Maybe Int
     }
 
 posDecoder : D.Decoder Pos
@@ -150,9 +153,12 @@ posDecoder = D.map3 Pos
 
 
 pointDecoder : D.Decoder Point
-pointDecoder = D.map2 Point
+pointDecoder = D.map5 Point
                (D.field "time" D.float)
                (D.field "pos" posDecoder)
+               (D.field "cadence" (D.maybe D.int))
+               (D.field "power" (D.maybe D.int))
+               (D.field "heartRate" (D.maybe D.int))
 
 trackDecoder : D.Decoder (List Point)
 trackDecoder = D.list pointDecoder