sort completed workouts by date

iphone/Werkout_ios/Views/WorkoutHistoryView.swift

@@ -38,7 +38,7 @@ struct WorkoutHistoryView: View {
     
     var body: some View {
         List {
-            ForEach(completedWorkouts, id:\.self.id) { completedWorkout in
+            ForEach(completedWorkouts.sorted(by: { $0.createdAt > $1.createdAt }), id:\.self.id) { completedWorkout in
                 HStack {
                     VStack {
                         if let date = completedWorkout.workoutStartTime.dateFromServerDate {

iphone/Werkout_ios/subview/CompletedWorkoutsView.swift

@@ -58,9 +58,7 @@ struct CompletedWorkoutsView: View {
         CompletedWorkoutFetchable().fetch(completion: { result in
             switch result {
             case .success(let model):
-                completedWorkouts = model.sorted(by: {
-                    $0.createdAt > $1.createdAt
-                })
+                completedWorkouts = model
             case .failure(let failure):
                 fatalError(failure.localizedDescription)
             }