Remove old code.

aiogram/dispatcher/middlewares.py

@@ -1,26 +0,0 @@
-from aiogram.utils.deprecated import deprecated
-from . import Handler
-from .handler import SkipHandler
-
-
-@deprecated
-class Middleware:
-    def __init__(self, handler, filters=None):
-        self.handler: Handler = handler
-        self.configure_handler(filters)
-
-    def configure_handler(self, filters):
-        if filters is None:
-            filters = []
-        self.handler.register(self._handle_event, filters, 0)
-
-    async def handle(self, *args, **kwargs):
-        raise NotImplementedError
-
-    async def check_data(self, *args, **kwargs):
-        return True
-
-    async def _handle_event(self, *args, **kwargs):
-        if await self.check_data(*args, **kwargs):
-            await self.handle(*args, **kwargs)
-        raise SkipHandler()