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

stdlib/wsgiref/util.pyi

@@ -10,10 +10,10 @@ class FileWrapper:
     def __init__(self, filelike: IO[bytes], blksize: int = ...) -> None: ...
     def __getitem__(self, key: Any) -> bytes: ...
     def __iter__(self) -> FileWrapper: ...
-    if sys.version_info < (3,):
-        def next(self) -> bytes: ...
-    else:
+    if sys.version_info >= (3, 0):
         def __next__(self) -> bytes: ...
+    else:
+        def next(self) -> bytes: ...
 
 def guess_scheme(environ: WSGIEnvironment) -> str: ...
 def application_uri(environ: WSGIEnvironment) -> str: ...