add type str to parameter other (#110)

Author: slaroche

sqlalchemy-stubs/sql/operators.pyi

@@ -46,7 +46,7 @@ class ColumnOperators(Operators):
     def notilike(self, other, escape: Optional[Any] = ...): ...
     def is_(self, other): ...
     def isnot(self, other): ...
-    def startswith(self, other, **kwargs): ...
+    def startswith(self, other: str, **kwargs): ...
     def endswith(self, other, **kwargs): ...
     def contains(self, other, **kwargs): ...
     def match(self, other, **kwargs): ...