Merge pull request #9 from YmiYugy/prefix

bumping Vulkan version for instance creation to 1.1
diff --git a/piet-gpu-hal/src/vulkan.rs b/piet-gpu-hal/src/vulkan.rs
index 35cf68f..e5de59b 100644
--- a/piet-gpu-hal/src/vulkan.rs
+++ b/piet-gpu-hal/src/vulkan.rs
@@ -161,7 +161,7 @@
                             .application_name(&app_name)
                             .application_version(0)
                             .engine_name(&app_name)
-                            .api_version(vk::make_version(1, 0, 0)),
+                            .api_version(vk::make_version(1, 1, 0)),
                     )
                     .enabled_layer_names(&layers)
                     .enabled_extension_names(&exts),