Change readme: level zero provider on both OSes

Author: szadam

README.md

@@ -136,7 +136,7 @@ A memory provider that provides memory from an operating system.
 Required packages for tests (Linux-only yet):
    - libnuma-dev
 
-#### Level Zero memory provider (Linux-only yet)
+#### Level Zero memory provider
 
 A memory provider that provides memory from L0 device.