public async Task <bool> HandleUpdatedPullRequest(PullRequest update, string identifier)
{
var profilePicture = await GetAuthorProfilePictureUrl(update).ConfigureAwait(false);
var payload = profilePicture != null
? SlackMessageFormatter.FormatUpdatedPullRequestWithImage(update, _configuration.Channel, identifier, profilePicture)
: SlackMessageFormatter.FormatUpdatedPullRequest(update, _configuration.Channel, identifier);
var success = await _client.UpdateMessage(payload).ConfigureAwait(false);
return(success.Ok);
}