Fix signature for slite3.fetchmany (#1444)

Also made pymssql.fetchmany simpler.

stdlib/2/sqlite3/dbapi2.pyi

@@ -1,8 +1,7 @@
 # Filip Hron <filip.hron@gmail.com>
 # based heavily on Andrey Vlasovskikh's python-skeletons https://github.com/JetBrains/python-skeletons/blob/master/sqlite3.py
 
-from typing import Any, Union, List, Iterator
-from numbers import Integral
+from typing import Any, Union, List, Iterator, Optional
 from datetime import time, datetime
 from collections import Iterable
 
@@ -141,7 +140,7 @@ class Cursor(Iterator[Any]):
     def executemany(self, sql: str, seq_of_parameters: Iterable[Iterable]): ...
     def executescript(self, sql_script: Union[bytes, unicode]) -> Cursor: ...
     def fetchall(self) -> List[Any]: ...
-    def fetchmany(self, size: Integral = ...) -> List[Any]: ...
+    def fetchmany(self, size: Optional[int] = ...) -> List[Any]: ...
     def fetchone(self) -> Any: ...
     def setinputsizes(self, *args, **kwargs): ...
     def setoutputsize(self, *args, **kwargs): ...

stdlib/3/sqlite3/dbapi2.pyi

@@ -3,7 +3,6 @@
 
 import sys
 from typing import Any, Union, List, Iterator, Optional, TypeVar, Callable
-from numbers import Integral
 from datetime import time, datetime
 from collections import Iterable
 
@@ -141,7 +140,7 @@ class Cursor(Iterator[Any]):
     def executemany(self, sql: str, seq_of_parameters: Iterable[Iterable]): ...
     def executescript(self, sql_script: Union[bytes, str]) -> Cursor: ...
     def fetchall(self) -> List[Any]: ...
-    def fetchmany(self, size: Integral = ...) -> List[Any]: ...
+    def fetchmany(self, size: Optional[int] = ...) -> List[Any]: ...
     def fetchone(self) -> Any: ...
     def setinputsizes(self, *args, **kwargs): ...
     def setoutputsize(self, *args, **kwargs): ...

third_party/2/pymssql.pyi

@@ -26,7 +26,7 @@ class Cursor(object):
     def executemany(self, stmt: str,
                     params: Optional[Sequence[Tuple[Scalar, ...]]]) -> None: ...
     def fetchall(self) -> List[Result]: ...
-    def fetchmany(self, size: Optional[Union[int, None]]) -> List[Result]: ...
+    def fetchmany(self, size: Optional[int]) -> List[Result]: ...
     def fetchone(self) -> Result: ...
 
 def connect(server: Optional[str],