/// <summary>
/// Mandatory middleware registered through pipelineBuilder because it simple.
/// But they have some crunches, that default middleware can't have.
/// </summary>
/// <param name="pipelineBuilder"></param>
void UseMandatoryMiddleware(IPipelineBuilder pipelineBuilder)
{
//Exception handling must used before all other.
pipelineBuilder.UseExceptionHandling();
pipelineBuilder.UseBotExt();
}