yapf: Unknown style option "EACH_DICT_ENTRY_ON_SEPARATE_LINE"

Hi I got a problem with one knob (`EACH_DICT_ENTRY_ON_SEPARATE_LINE`)
This is my `.style.yapf`:
```yml
[style]
based_on_style = pep8
column_limit = 160
dedent_closing_brackets = true
each_dict_entry_on_separate_line = true
spaces_before_comment = 2
split_before_logical_operator = true
split_arguments_when_comma_terminated = true
```

When I run this command:
``` yapf -r --diff ```

I get:
```yapf: Unknown style option "EACH_DICT_ENTRY_ON_SEPARATE_LINE"```

I am using `Python 3.7.0` and `yapf==0.26.0`

Thanks for helping me