code: @NonNull
    @SuppressWarnings("WeakerAccess")
    public SnackbarWrapper appendMessage(@StringRes int message,
                                         @ColorRes int color) {
      return appendMessage(context.getString(message),
          ContextCompat.getColor(context, color));
    }
docs: Append text in the specified color to the Snackbar.
  
  @param message The string resource of the text to append.
  @param color   The resource of the color to apply to the text.
  @return This instance.