message: Three vertices are sufficient for the full screen background
  Fixes
diff: /*
  * Vulkan Example - Instanced mesh rendering, uses a separate vertex buffer for instanced data
  *
  -* Copyright (C) 2016 by Sascha Willems - www.saschawillems.de
  +* Copyright (C) 2016-2021 by Sascha Willems - www.saschawillems.de
  *
  * This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
  */
  @@ -140,7 +140,7 @@ public:
  // Star field
  vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets.planet, 0, NULL);
  vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.starfield);
  - vkCmdDraw(drawCmdBuffers[i], 4, 1, 0, 0);
  + vkCmdDraw(drawCmdBuffers[i], 3, 1, 0, 0);
  // Planet
  vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets.planet, 0, NULL);
  