from aiogram import Bot, Dispatcher, executor, types
TOKEN = 'твой токен'
bot = Bot(token=TOKEN)
dp = Dispatcher(bot)
@dp.message_handler(commands=['start'])
async def hello_user(message: types.Message):
await message.answer(f'Привет {message.from_user.username}!')
if __name__ == '__main__':
executor.start_polling(dp, skip_updates=True)