Add missing Dict imports.

stdlib/3/cgi.pyi

@@ -1,4 +1,4 @@
-from typing import Tuple
+from typing import Dict, Tuple
 
 def escape(s: str, quote: bool = ...) -> str: ...
 def parse_header(s: str) -> Tuple[str, Dict[str, str]]: ...

stdlib/3/email/headerregistry.pyi

@@ -2,7 +2,7 @@
 
 import datetime as dt
 import sys
-from typing import Tuple, Optional, Any, Union, Mapping
+from typing import Dict, Tuple, Optional, Any, Union, Mapping
 from email.errors import MessageDefect
 if sys.version_info >= (3, 3):
     from email.policy import Policy

stdlib/3/gc.pyi

@@ -1,6 +1,6 @@
 # Stubs for gc
 
-from typing import Any, List, Tuple
+from typing import Any, Dict, List, Tuple
 
 
 DEBUG_COLLECTABLE = ...  # type: int

stdlib/3/http/cookies.pyi

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

stdlib/3/unittest/__init__.pyi

@@ -1,7 +1,7 @@
 # Stubs for unittest
 
 from typing import (
-    Any, Callable, Iterable, Iterator, List, Optional, Pattern, Sequence,
+    Any, Callable, Dict, Iterable, Iterator, List, Optional, Pattern, Sequence,
     TextIO, Tuple, Type, TypeVar, Union,
     overload,
 )

stdlib/3/urllib/request.pyi

@@ -1,8 +1,8 @@
 # Stubs for urllib.request (Python 3.4)
 
 from typing import (
-    Any, Callable, List, IO, Mapping, Optional, Sequence, Tuple, TypeVar, Union,
-    overload,
+    Any, Callable, Dict, List, IO, Mapping, Optional, Sequence, Tuple, TypeVar,
+    Union, overload,
 )
 from http.client import HTTPResponse, HTTPMessage
 from http.cookiejar import CookieJar