future first: switch the order of some if statements (#5206)

Since we're adding this to our contribution guidelines in
https://github.com/python/typeshed/pull/5205

stubs/xxhash/xxhash.pyi

@@ -1,10 +1,10 @@
 import sys
 from _typeshed import ReadableBuffer
 
-if sys.version_info < (3,):
-    from hashlib import _hash as _Hash
-else:
+if sys.version_info >= (3, 0):
     from hashlib import _Hash
+else:
+    from hashlib import _hash as _Hash
 
 VERSION: str
 XXHASH_VERSION: str