Make module re-exports compliant with PEP 484

Author: Michael0x2a

third_party/2and3/typing_extensions.pyi

@@ -1,20 +1,26 @@
 import sys
 import typing
-from typing import (
-    ClassVar, ContextManager, Counter, DefaultDict, Deque,
-    NewType, overload, Text, TYPE_CHECKING,
-)
+from typing import ClassVar as ClassVar
+from typing import ContextManager as ContextManager
+from typing import Counter as Counter
+from typing import DefaultDict as DefaultDict
+from typing import Deque as Deque
+from typing import NewType as NewType
+from typing import overload as overload
+from typing import Text as Text
+from typing import TYPE_CHECKING as TYPE_CHECKING
 
 if sys.version_info >= (3, 3):
-    from typing import ChainMap
+    from typing import ChainMap as ChainMap
 
 if sys.version_info >= (3, 5):
-    from typing import (
-        AsyncIterable, AsyncIterator, AsyncContextManager, Coroutine,
-    )
+    from typing import AsyncIterable as AsyncIterable
+    from typing import AsyncIterator as AsyncIterator
+    from typing import AsyncContextManager as AsyncContextManager
+    from typing import Coroutine as Coroutine
 
 if sys.version_info >= (3, 6):
-    from typing import AsyncGenerator
+    from typing import AsyncGenerator as AsyncGenerator
 
 # Return type that indicates a function does not return.
 # This type is equivalent to the None type, but the no-op Union is necessary to