message: Update readme for entry
diff: @@ -110,7 +110,7 @@ use ash::{Device, Instance};
  // Specifies the version that you want to load
  use ash::version::V1_0;
  // Those traits implement the version specific functions
  -use ash::{InstanceV1_0, DeviceV1_0};
  +use ash::{InstanceV1_0, DeviceV1_0, EntryV1_0};
  let entry = Entry::<V1_0>::new().unwrap();
  let instance = entry.create_instance(...).expect("Instance creation error.");
  let device = instance.create_device(...).expect("Device creation error.");
  