Update README with migration notes: simple decorator usage is broken after `NotConfiguredError` introducing about cashews

[AIGeneratedUsername]

I use cashews.backends.redis.Redis and cashews.backends.redis.Memory directly. I think I will need to put somewhere Redis.setup() and Memory.setup() just to make the package happy and avoid raising the error.

[Krukov]

Yep I think that we need to update code examples

[agcrum]

How should the decorator be used?

[Krukov]

@agcrum Hi. An example is next:

import asyncio
from cashews import cache

cache.setup("mem://")

@cache(ttl=1)
async def long_running_function(foo):
    await asyncio.sleep(1)
    print(foo)


asyncio.run(long_running_function(foo="bar"))
asyncio.run(long_running_function(foo="bar"))