message: Fix inverted assert condition.
diff: @@ -39,7 +39,7 @@ namespace Hyperledger.Indy.Utils
  /// <returns>The command handle to use for tracking the task completion source.</returns>
  public static int Add<T>(TaskCompletionSource<T> taskCompletionSource)
  {
  - Debug.Assert(taskCompletionSource == null, "A task completion source is required.");
  + Debug.Assert(taskCompletionSource != null, "A task completion source is required.");
  var commandHandle = GetNextCommandHandle();
  _taskCompletionSources.Add(commandHandle, taskCompletionSource);
  