Add missing List imports.

stdlib/3/calendar.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Iterable, Optional, Tuple, Sequence
+from typing import Any, Iterable, List, Optional, Tuple, Sequence
 import datetime
 
 LocaleType = Tuple[Optional[str], Optional[str]]

stdlib/3/email/charset.pyi

@@ -1,6 +1,6 @@
 # Stubs for email.charset (Python 3.4)
 
-from typing import Optional, Iterator, Any
+from typing import List, Optional, Iterator, Any
 
 class Charset:
     input_charset = ...  # type: str

stdlib/3/email/message.pyi

@@ -1,7 +1,7 @@
 # Stubs for email.message (Python 3.4)
 
 from typing import (
-    Optional, Union, Tuple, TypeVar, Generator, Sequence, Iterator, Any
+    List, Optional, Union, Tuple, TypeVar, Generator, Sequence, Iterator, Any
 )
 import sys
 from email.charset import Charset

stdlib/3/email/policy.pyi

@@ -1,7 +1,7 @@
 # Stubs for email.policy (Python 3.4)
 
 from abc import abstractmethod
-from typing import Any, Optional, Tuple, Union, Callable
+from typing import Any, List, Optional, Tuple, Union, Callable
 import sys
 from email.message import Message
 from email.errors import MessageDefect

stdlib/3/http/cookies.pyi

@@ -1,6 +1,6 @@
 # Stubs for http.cookies (Python 3.5)
 
-from typing import Generic, Mapping, MutableMapping, Optional, TypeVar, Union
+from typing import Generic, List, Mapping, MutableMapping, Optional, TypeVar, Union
 
 _DataType = Union[str, Mapping[str, Union[str, 'Morsel']]]
 _T = TypeVar('_T')

stdlib/3/multiprocessing/process.pyi

@@ -1,3 +1,4 @@
+from typing import List
 from multiprocessing import Process
 
 def current_process() -> Process: ...