Update 09-udf.md

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@ -602,7 +602,7 @@ taos> select ts, v1, v2, v3, nsum(v1, v2, v3) from t;
Query OK, 4 row(s) in set (0.010653s)
```
Sample 4: Utilize 3rd party package
#### Sample 4: Utilize 3rd party package
A UDF which accepts a timestamp and output the next closed Sunday. This sample requires to use third party package `moment`, you need to install it firslty.