Added usage example of errors_handler

Optimized generation of default/inline keyboard
Customizing webhook path has become more flexible
Updated aiogram version to 2.7 (BotAPI 4.7)

handlers/errors/__init__.py

@@ -0,0 +1,9 @@
+from aiogram import Dispatcher
+from aiogram.utils import exceptions
+
+from .not_modified import message_not_modified, message_to_delete_not_found
+
+
+def setup(dp: Dispatcher):
+    dp.register_errors_handler(message_not_modified, exception=exceptions.MessageNotModified)
+    dp.register_errors_handler(message_to_delete_not_found, exception=exceptions.MessageToDeleteNotFound)