Error when calling get() on RateLimiterRedis
Hi,

When I call rateLimiterRedis to get info I am getting an error. 

Here is the code implementation:

```
import { createClient } from "redis";
import { RateLimiterRedis } from "rate-limiter-flexible";

const redisClient = createClient({
  url: process.env.REDIS_URL,
  disableOfflineQueue: true,
});

const maxFailedTriesLogin = 5;

const loginRateLimiterRedis = new RateLimiterRedis({
  storeClient: redisClient,
  keyPrefix: "login_tries",
  points: maxFailedTriesLogin,
  duration: 60 * 5,
  inMemoryBlockOnConsumed: 5,
  inMemoryBlockDuration: 60 * 5,
  blockDuration: 60 * 30,
});

const ipEmail = getIpAndEmail(req.ip, email);
const rlIpEmail = await loginRateLimiterRedis.get(ipEmail);
```


Here is the basic error response:

**TypeError: this.client.multi(...).get(...).pttl is not a function**

I am using redis package version 4.3.1.

Any suggestions how to fix this issue please?