Close http session on connection.close()

Author: mdesmet

trino/dbapi.py

@@ -170,9 +170,8 @@ def __exit__(self, exc_type, exc_value, traceback):
             self.close()
 
     def close(self):
-        """Trino does not have anything to close"""
         # TODO cancel outstanding queries?
-        pass
+        self._http_session.close()
 
     def start_transaction(self):
         self._transaction = Transaction(self._create_request())