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/sunau.pyi

@@ -20,9 +20,7 @@ AUDIO_FILE_ENCODING_ADPCM_G723_5: int
 AUDIO_FILE_ENCODING_ALAW_8: int
 AUDIO_UNKNOWN_SIZE: int
 
-if sys.version_info < (3, 0):
-    _sunau_params = Tuple[int, int, int, int, str, str]
-else:
+if sys.version_info >= (3, 0):
     class _sunau_params(NamedTuple):
         nchannels: int
         sampwidth: int
@@ -31,6 +29,9 @@ else:
         comptype: str
         compname: str
 
+else:
+    _sunau_params = Tuple[int, int, int, int, str, str]
+
 class Au_read:
     def __init__(self, f: _File) -> None: ...
     if sys.version_info >= (3, 3):