Fix in operator annotations (and corresponding imports) (#200)

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

Author: ilevkivskyi

sqlalchemy-stubs/sql/operators.pyi

@@ -1,6 +1,6 @@
 from typing import Any, Iterable, Optional, Text, Union
-from .selectable import Select as Select
-from .elements import BindParameter as BindParameter, UnaryExpression
+from .selectable import Select, Alias
+from .elements import BindParameter, UnaryExpression
 
 class Operators(object):
     def __and__(self, other): ...
@@ -42,8 +42,8 @@ class ColumnOperators(Operators):
     def concat(self, other): ...
     def like(self, other: Text, escape: Optional[Any] = ...): ...
     def ilike(self, other: Text, escape: Optional[Any] = ...): ...
-    def in_(self, other: Union[Iterable[Any], BindParameter, Select]): ...
-    def notin_(self, other: Union[Iterable[Any], BindParameter, Select]): ...
+    def in_(self, other: Union[Iterable[Any], BindParameter, Select, Alias]): ...
+    def notin_(self, other: Union[Iterable[Any], BindParameter, Select, Alias]): ...
     def notlike(self, other, escape: Optional[Any] = ...): ...
     def notilike(self, other, escape: Optional[Any] = ...): ...
     def is_(self, other): ...