Update advanced.md

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Tom Christie 2019-11-30 21:46:07 +00:00 committed by GitHub
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@ -363,6 +363,7 @@ name of the payloads as keys and a tuple of elements as values.
```
More specifically, this tuple must have at least two elements and maximum of three:
- The first one is an optional file name which can be set to `None`.
- The second may be a file-like object or a string which will be automatically
encoded in UTF-8.