When using memcached, specifying TTL in set_config results in an error.

[reeya2022]

Hello.
When using memcached, specifying TTL in set_config results in an error.
Thanks.

aiocache 0.12.0
Python 3.9.7

import asyncio
from aiocache import caches

caches.set_config({
    'default': {
        'cache': "aiocache.SimpleMemoryCache",
        'serializer': {
            'class': "aiocache.serializers.PickleSerializer"
        },
    },
    'memcached': {
        'cache': "aiocache.MemcachedCache",
        'serializer': {
            'class': "aiocache.serializers.PickleSerializer"
        },
        'ttl': int(3),
    }
})

async def main():
    cache = caches.create('memcached')
    await cache.set('key', 'value')
    ret = await cache.get('key')
    print(ret)

asyncio.run(main())

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/aiocache/backends/memcached.py", line 44, in _set
    return await self.client.set(key, value, exptime=ttl or 0)
  File "/usr/local/lib/python3.9/site-packages/aiomcache/client.py", line 42, in wrapper
    return await func(self, conn, *args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/aiomcache/client.py", line 338, in set
    return await self._storage_command(conn, b"set", key, value, exptime)
  File "/usr/local/lib/python3.9/site-packages/aiomcache/client.py", line 302, in _storage_command
    raise ValidationException('exptime not int', exptime)
aiomcache.exceptions.ValidationException: exptime not int: 3.0

[Dreamsorcerer]

Feel free to provide a PR to fix this in the 0.x releases.
But, I expect the entire config functionality will be removed in 1.0.