Update dropbox example.
@@ -128,7 +128,7 @@ with data_file.open("w") as f:
# method 3: via target formatters, which provide load/dump methods
# for a number of file extensions, such as json, the formatter is automatically selected
-# (current formatters: text, json, zip, tar, numpy, root, uproot, root_numpy, tf_const_graph)
+# (current formatters: text, json, yaml, pickle, zip, tar, numpy, root, uproot, root_numpy, tf_const_graph)
data_file.dump(data, indent=4)
```
