Making member readonly

Author: StanleyGoldman

src/GitHub.App/ViewModels/GitHubPane/PullRequestDetailViewModel.cs

@@ -38,6 +38,7 @@ public sealed class PullRequestDetailViewModel : PanePageViewModelBase, IPullReq
         readonly IUsageTracker usageTracker;
         readonly ITeamExplorerContext teamExplorerContext;
         readonly ISyncSubmodulesCommand syncSubmodulesCommand;
+        readonly IViewViewModelFactory viewViewModelFactory;
         IModelService modelService;
         PullRequestDetailModel model;
         IActorViewModel author;
@@ -55,7 +56,6 @@ public sealed class PullRequestDetailViewModel : PanePageViewModelBase, IPullReq
         bool refreshOnActivate;
         Uri webUrl;
         IDisposable sessionSubscription;
-        IViewViewModelFactory viewViewModelFactory;
         IReadOnlyList<IPullRequestCheckViewModel> checks;
 
         /// <summary>