vk.get_physical_device_properties segmentation fault

[stetre]

Calling vk.get_physical_device_properties( ) without enabling the VK_KHR_get_physical_device_properties2 instance extension causes a segmentation fault.

System: Ubuntu 18.04, NVidia 390.116, VulkanSDK 1.1.116.0, MoonVulkan 0.8.

This affects most of the examples. The workaround is to explicitly enable the extension when calling vk.create_instance( ) (even though this should not be needed when using Vulkan 1.1, because the extension has been promoted to core).