Fix missing handler_type arg

Author: mhadam

pytest_httpserver/httpserver.py

@@ -972,11 +972,12 @@ def clear_all_handlers(self):
         self.oneshot_handlers = RequestHandlerList()
         self.handlers = RequestHandlerList()
 
-    def expect(self, matcher: RequestMatcher) -> RequestHandler:
+    def expect(self, matcher: RequestMatcher, handler_type: HandlerType = HandlerType.PERMANENT) -> RequestHandler:
         """
         Create and register a request handler.
 
         :param matcher: :py:class:`RequestMatcher` used to match requests.
+        :param handler_type: type of handler
         """
         request_handler = RequestHandler(matcher)
         if handler_type == HandlerType.PERMANENT: