Update README.md

```
           tweet n+2                   tweet n+1                   tweet n
| 8 bytes   8 bytes  1 byte | 8 bytes   8 bytes  1 byte | 8 bytes   7 bytes  1 byte |
| tweet_id  user_id  meta   | tweet_id  user_id  meta   | tweet_id  user_id  meta   |
```

should the 7 be 8?
pull/116/head
Tony Yao 2017-11-05 15:21:02 -08:00 committed by GitHub
parent 15237daf59
commit a3c7fc04e1
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@ -124,7 +124,7 @@ If our **Memory Cache** is Redis, we could use a native Redis list with the foll
``` ```
tweet n+2 tweet n+1 tweet n tweet n+2 tweet n+1 tweet n
| 8 bytes 8 bytes 1 byte | 8 bytes 8 bytes 1 byte | 8 bytes 7 bytes 1 byte | | 8 bytes 8 bytes 1 byte | 8 bytes 8 bytes 1 byte | 8 bytes 8 bytes 1 byte |
| tweet_id user_id meta | tweet_id user_id meta | tweet_id user_id meta | | tweet_id user_id meta | tweet_id user_id meta | tweet_id user_id meta |
``` ```