vulkaninfo: Update copyright date to 2019
vulkaninfo: Update copyright date to 2019

Change-Id: Ie4f1aefae4603e6b27ec75b7d7b6a36f8cd94bc3

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools